Question 16

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%

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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