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WAEC Mathematics 2019 Paper

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Question : 15

Total: 50

Bala sold an article for #6,900.00 and made a profit of 15%. Calculate his percentage profit if he had sold it for N6,600.00.

5%
10%
12%
13%

Solution:

Concept:

Profit percentage is calculated on the cost price, so first find the cost price from the given 15% profit.

Explanation:

Let cost price

= C

.

When sold for

\mathrm{N}6{,}900

, profit is 15%.

So,

6{,}900 = \frac{115}{100}C

.

Therefore,

C = \frac{6{,}900 \times 100}{115} = \mathrm{N}6{,}000

.

If sold for

\mathrm{N}6{,}600

, profit

= 6{,}600 - 6{,}000 = \mathrm{N}600

.

Required profit percentage

= \frac{600}{6{,}000} \times 100 = 10\%

.

Answer:

B. 10%

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