Cambridge International Mathematics

228 Topics in arithmetic (Chapter 10)

Review set 10A

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1 What multiplier corresponds to:

a a13%decrease b a 10 :9%increase?

2aIncrease$2500by16%: b Decrease 65 kg by10%.

3 In the long jump, Tran jumps 5 : 65 m and Lim beats this distance by7%. How far did Lim jump?

4 Eito purchases a pair of shoes forU 6100 and marks them up45%for sale. What is:

a the selling price b the profit?

5 Moira bought a car for$ 4500 but had to sell it for$ 4000 a few weeks later. What was her:

a loss b percentage loss?

6 A store has an item for$80and discounts it by15%. Find:

a the discount b the sale price.

7 David purchased a stamp collection forE 860. Two years

later it was valued atE 2410. Calculate the percentage

increase in the value of the investment.

8 A publisher sells a book for$20per copy to a retailer.

The retailer marks up the price by75%and then adds

10%for a goods tax. What price does the customer pay?

9 The annual rate of inflation is predicted to be3%next year, then 3 :5%in the year after that. What

will be the cost in two years’ time of an item that currently costs$50if the cost rises in line with

inflation?

10 How much is borrowed if a simple interest rate of8%p.a. results in an interest charge of$3600

after 3 years?

11 A person wants to earn$ 3000 interest on an investment of$17 000over 3 years. What is the

minimum simple interest rate that will achieve this target?

12 How long would it take to earnE 5000 interest on an investment ofE22 500at a rate of 9 :5%p.a.

simple interest?

13 Calculate the simple interest on a$6000loan at a rate of 8 :5%p.a. over 3 years.

14 Find the final value of a compound interest investment of$20 000after 3 years at 7 :5%p.a. with

interest calculated annually.

15 Which of the following would earn more interest on a$7500investment for 4 years:

² 9%p.a. simple interest calculated annually or

² 8%p.a. compounded interest calculated annually?

16 Find the time taken to drive 305 km at an average speed of 70 km/h.

17 A motorist drives for 30 minutes at 90 km/h, and then for 1 hour at 60 km/h. Find:

a the total distance travelled b the average speed for the whole trip.

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Y:\HAESE\IGCSE01\IG01_10\228IGCSE01_10.CDR Tuesday, 14 October 2008 10:19:53 AM PETER