waecmaths question:
Ladi sold a car for N84,000 at a loss of 4%. How much did Ladi buy the car?.
Option A:
N80,500
Option B:
N80,640
Option C:
N87,360
Option D:
N87,500
waecmaths solution:
$\begin{align} & \text{let cost price }x \\ & percentage\text{ }loss=\frac{\text{loss}}{\text{cost price}}\times 100percent \\ & 0.04=\frac{\text{cost price}-84000}{\text{cost price}} \\ & 0.04=\frac{x-84000}{x} \\ & 0.04x=x-84000 \\ & x-0.04x=84000 \\ & 0.96x=84000 \\ & x=\frac{84000}{0.96}=87,500 \\ & \text{The cost price N87,500} \\\end{align}$
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