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JAMB Mathematics 2015 Paper

Question : 57

Total: 61

If duty is levied at 25%, find the duty to be added to a bill of N80.

Solution:

Concept:

Duty is a percentage of the bill amount, so we calculate the given percentage of the total bill.

Explanation:

The duty rate is

25\%

The bill amount is

N80

Therefore, duty to be added is

25\%

N80

Write the percentage as a fraction:

25\% = \frac{25}{100}

Multiply:

\frac{25}{100} \times 80

Simplify:

\frac{25 \times 80}{100} = \frac{2000}{100} = 20

So the duty added is

N20

Answer:

\$N20

(Option B).

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