Question

Orange are bought at $100$ for $Rs.80$ and all of them are sold at $80$ for $Rs.100$. Find the loss or gain as percent in this transaction.

Answer 1

Cost price of one orange $=\frac{80}{100}=Rs.0.8$

Selling price of one orange $=\frac{100}{80}=Rs.1.25$

Since selling price is more than cost price.

Therefore,

Gain $\%=\frac{1.25-0.8}{0.8}\times 100=\frac{0.45}{0.8}\times 100=0.45\times 125=56.25\%$