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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:

15 = ( $\frac{\;6,900\;-\;\mathrm{C.P}\;\times\;100}{\mathrm{C.P}}$ )

15 C.P = 690000 - C.P 100

C.P = $\frac{\;690000}{115}$

C.P = N6,000

%profit = $\frac{\;6,600\;-\;6,000}{6,000}$ x 100

= $\frac{\;600}{6,000}$ x 100

= 10%

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