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Interest Calculation Vault

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Interest Calculation Vault

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About this activity

Calculate simple interest clues

Created by

Hidden Author
Hidden Author
Lebanon

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Interest Calculation Vault
 

Interest Calculation VaultOnline version

Calculate simple interest clues

by Hidden Author
1

Find 5% simple interest on K10 000 for 1 year.

Hints

Rate is 5% and time is 1 year.

Multiply principal by rate, then by time.

Percent of the principal per year.

2

Find 5% simple interest on K20 000 for 1 year.

Hints

Compute 5% of the new principal.

Same rate and time as the first problem.

Double the first case since the principal doubles.

3

Find 5% simple interest on K20 000 for 3 years.

Hints

Interest grows with time at the same rate.

Keep rate at 5% and multiply by 3 years.

Rate times time increases with years.

4

Mrs Mweemba borrows K50 000 at 6% simple interest for 1 year. Find the interest.

Hints

What is 6% of 50 000?

Time is 1 year, rate 6%.

Use the formula: Principal × Rate × Time.

5

Mrs Mweemba borrows K50 000 at 6% for 2 years. Find the simple interest.

Hints

What is 12% of 50 000?

Compute 6% × 50 000 × 2.

Time doubles, rate unchanged.

6

K30 000 is invested at 4% for 2 years. Find the interest.

Hints

4% for 2 years of 30 000.

Interest = Principal × Rate × Time.

Time is 2 years.

7

K25 000 is invested at 8% for 1 year. Find the interest.

Hints

What is 0.08 × 25 000?

Calculate 8% of 25 000.

One year at 8% of 25 000.

8

K40 000 is invested at 5% for 2 years. Find the interest.

Hints

Compute 5% of 40 000, then double.

Interest = 40 000 × 0.05 × 2.

Two years at 5%.

9

K12 000 is invested at 10% for 3 years. Find the interest.

Hints

What is 10% of 12 000 for three years?

Interest = 12 000 × 0.10 × 3.

Three years at 10%.

10

Principal K20 000 earns K3 000 interest. What is the total amount?

Hints

P = 20 000, I = 3 000.

Total = Principal + Interest.

Add interest to the principal.

 
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