waecmaths question:
Bala sold an article for N6,900.00 and made a profit of 15%. Calculate his percentage profit if he had sold it for N6,600
Option A:
5%
Option B:
10%
Option C:
12%
Option D:
13%
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waecmaths solution:
Let the cost price be x
%profit at N6,900 = 15%
$\frac{6900-x}{x}\times 100%=15%$
$\frac{6900-x}{x}=0.15$
$6900-x=0.15x$
$1.15x=6900$
$x=6000$
$\text{The cost price is N6000}$
% profit at N6,600
$\frac{6600-6000}{6000}\times 100%=\frac{600}{6000}\times 100%=10%$
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