A vendor bought mangoes at the rate of 8 for ₹12 and sold them at the rate of 6 for ₹10. Find his percentage gain.

Correct option is B

Given:
The vendor bought 8 mangoes for ₹12
The vendor sold 6 mangoes for ₹10
Formula Used:
​$$\text{Percentage Gain} = \frac{\text{Gain}}{\text{Cost Price}} \times 100$$​​
Where, Gain = Selling Price - Cost Price
Solution:
Cost price per mango = $$\frac{12}{ 8}$$​ = $$\frac{3}{ 2}$$​​
Selling price per mango = $$\frac{10}{ 6} = \frac 53$$​
Gain per mango = S.P. - C.P. = $$\frac 53- \frac 32= \frac{10-9}{6}= \frac{1}{6}$$​​
Percentage Gain = $$\frac {\frac{1}{6}}{\frac{3}{2}} \times 100$$ = $$\frac{100}9 \%$$​​