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  • On his first birthday, baby Kevin’s granny pays R500 into a bank account for him. On every subsequent birthday until he turns eighteen, she does the same. If we assume that the rate of interest stayed at 10% during these 17 years, and the interest is calculated at the end of each year on the money in the bank, and then added to the investment, we can calculate the value of his investment. On his second birthday this happens:
  • R500 (the first payment) + R50 (the interest) + R500 (the second payment) = R1 050 is the new amount in the bank.
  • A year later (three years old): R1 050 + R105 + R500 = R1 655 in the bank.
  • Then: R1 655 + R165,50 + R500 = R2320,50 et cetera: Complete the sum!

4.1 Mrs Van der Merwe, whose investments we looked at before, now inherits an amount of R95 000. She invests this, this time at an interest rate of 11,5% per annum. The interest is again paid out to her every month. Mrs Van der Merwe also receives a monthly pension of R3 100 from the pension fund of her previous employer. What is the total amount she receives every month?

5 Cars or furniture are often bought on hire purchase. This is a special type of loan for buying large items. It is convenient, but the interest rate is high, the goods have to be insured, a large deposit is required, the repayments are high and the full amount has to be paid within a certain period or the goods can be repossessed. This kind of loan is only given to people who have a fixed job, and then the maximum loan is determined by how much you earn to be sure that you can meet the repayments. An example is when someone wants to buy a new car. She has a steady job, and she has already saved R3 800. The salesman accepts her old car, which he values at R4 100, as part of the deposit. To buy a car costing R70 800,00 she will have to pay about R1 800 per month for 54 months before the car is her property.

5.1 What is the total amount of money she will have paid at the end of the 54 months?

5.2 Say she gets a loan from the bank at a rate of 18%, sells her old car at R4 000 and uses this and her savings to pay the R70 800 for the new car. She pays the bank loan off at a rate of R1 800 per month. What is the total cost of the car at the end of her loan repayments?

6 You have to have money in a foreign currency when you travel overseas. If you want to visit America, you have to exchange your rand for dollars. The amount of rand you have to pay for one dollar fluctuates from day to day. It has been as low as R1,50 in the past, and recently it was R13,80. This relationship between two currencies is called the exchange rate . An American tourist in South Africa paying about R35 for a hamburger, chips and cool drink, can calculate that the meal will cost him about $3,50 if the exchange rate is R10,00 per dollar.

6.1 How many British pounds (£) will a visitor from England pay for the same meal, if the rand–pound exchange rate is 14,85?

end of CLASS WORK

QUALITY OF ANSWERS poor1 unsatisfactory2 satisfactory3 excellent4
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Questions & Answers

A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
Aislinn Reply
cm
tijani
what is titration
John Reply
what is physics
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A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance
Jude Reply
Can you compute that for me. Ty
Jude
what is the dimension formula of energy?
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David
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emma Reply
what is chemistry
Youesf Reply
what is inorganic
emma
Chemistry is a branch of science that deals with the study of matter,it composition,it structure and the changes it undergoes
Adjei
please, I'm a physics student and I need help in physics
Adjanou
chemistry could also be understood like the sexual attraction/repulsion of the male and female elements. the reaction varies depending on the energy differences of each given gender. + masculine -female.
Pedro
A ball is thrown straight up.it passes a 2.0m high window 7.50 m off the ground on it path up and takes 1.30 s to go past the window.what was the ball initial velocity
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2. A sled plus passenger with total mass 50 kg is pulled 20 m across the snow (0.20) at constant velocity by a force directed 25° above the horizontal. Calculate (a) the work of the applied force, (b) the work of friction, and (c) the total work.
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you have been hired as an espert witness in a court case involving an automobile accident. the accident involved car A of mass 1500kg which crashed into stationary car B of mass 1100kg. the driver of car A applied his brakes 15 m before he skidded and crashed into car B. after the collision, car A s
Samuel Reply
can someone explain to me, an ignorant high school student, why the trend of the graph doesn't follow the fact that the higher frequency a sound wave is, the more power it is, hence, making me think the phons output would follow this general trend?
Joseph Reply
Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
Joseph
"Generation of electrical energy from sound energy | IEEE Conference Publication | IEEE Xplore" ***ieeexplore.ieee.org/document/7150687?reload=true
Ryan
what's motion
Maurice Reply
what are the types of wave
Maurice
answer
Magreth
progressive wave
Magreth
hello friend how are you
Muhammad Reply
fine, how about you?
Mohammed
hi
Mujahid
A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?
yasuo Reply
Who can show me the full solution in this problem?
Reofrir Reply
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Source:  OpenStax, Mathematics grade 9. OpenStax CNX. Sep 14, 2009 Download for free at http://cnx.org/content/col11056/1.1
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