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Whole Numbers II - JSS3 Mathematics Past Questions and Answers - page 2

11

What is the compound interest earned on $1500 at an annual interest rate of 4% compounded annually for 3 years?

A

$187.20

B

$180.00

C

$187.50

D

$190.00

correct option: a
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12

If the principal amount is $2000, the annual interest rate is 6%, and the interest is compounded annually, what is the amount after 2 years?

A

$2240

B

$2120

C

$2247.20

D

$2200

correct option: c
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13

Simplify the expression 5×(3+2).

14

Simplify 4/5×(10−2).

4/5×8 =32/5

32/5 =6.4

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15

If 6 pencils cost $12, how much do 9 pencils cost?

12/6= 2 dollars per pencil. So, 9 pencils cost 

9×2=18 dollars.

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16

If 4 workers can finish a job in 8 days, how many days will it take for 8 workers to finish the same job?

Using inverse proportion: 

4×8=8×𝑑,

so 𝑑=32/8= 4 days.

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17

Calculate the amount after 1 year for a principal amount of $500 at an annual interest rate of 10%, compounded annually.

𝐴=500(1+0.10/1)1×1

=500×1.10

=550. 

The amount after 1 year is $550.

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18

What is the compound interest earned on $1000 at an annual interest rate of 5%, compounded annually for 2 years?

𝐴=1000(1+0.05/1)1×2

=1000×1.1025

=1102.50. 

The compound interest earned is 1102.50−1000=102.50 dollars.

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