Cambridge International Mathematics

Topics in arithmetic (Chapter 10) 229

Review set 10B

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1 What multiplier corresponds to:

a a10%increase b an 11 :7%decrease?

2aIncrease$ 3625 by8%. b Decrease 387 km by 1 :8%.

3 Adam bought a bicycle forE 165 and sold it soon after forE 130. What was Adam’s:

a loss b percentage loss?

4 A furniture store bought a chair forE 380 , marked it up by35%and then discounted it by15%.

What was:

a the marked-up price b the discounted price?

5 A company cut its advertising budget by12%. If the company previously spent$80 000on

advertising, what was the new advertising budget?

6 A toaster is sold to a retailer forE 38. The retailer marks it up by40%, discounts it by15%, and

then sells it to a customer after adding on a goods tax of16%. What did the customer pay?

7 For the next three years the annual inflation rate is predicted to be 3 :2%, 4 :1%and 4 :8%. If this

occurs, what should be the value of a house currently at$325 000?

8 What simple interest is earned on an investment of$6500for 4 years at 6 :8%p.a.?

9 How much is borrowed if a simple interest rate of 7 :2%p.a. results in an interest charge of$216

after 212 years?

10 How long would it take for a loan ofE45 000to earnE15 120interest at a rate of8%p.a. simple

interest?

11 An investment of$25 000is made for 4 years at 8 :2%p.a. compounded yearly. Find:

a the final value of the investment b the interest earned.

12 E 8000 is invested for 10 years at8%p.a.

a the final value of the investment b the amount of interest earned

c the simple interest rate needed to be paid for the same return on the investment.

13 Find the distance travelled by flying at an average speed of 780 km/h for 1 hour 40 minutes.

14 The graph shows the distance travelled by two families

between New York and Washington DC. Use the graph

to find:

a the distance from New York to Washington DC

b how much quicker the Maple family completed the

trip than the Johnson family

c the average speed for each family over the first two

hours

d the average speed for the Johnsons over the whole

trip.

15 How much must be invested now at 9 :3%compound interest p.a. if it is to amount to$ 6000 in

10 years’ time?

distance (km)

time (hours)

0

100

200

23

Maple

Johnson

1

300

compound interest. Find:

IGCSE01

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(^05255075950525507595)
100 100
(^05255075950525507595)
100 100
Y:\HAESE\IGCSE01\IG01_10\229IGCSE01_10.CDR Tuesday, 14 October 2008 10:23:51 AM PETER