A vendor buys apples at the rate of 21 for Rs 7 and sells at the rate of 5 for Rs 2. What will be the result?
The vendor buys 21 apples for Rs. 7
=> Cost price of 1 apple = $$\frac{7}{21}$$ = Rs 0.33
He sells 5 apples for Rs. 2
=> Selling price of 1 apple = $$\frac{2}{5}$$ =Â Rs 0.4
$$\because$$ Selling price is more than Cost price, the vendor earns a profit
=> Profit % = $$\frac{(0.4 - 0.33)}{0.33} \times 100$$
= $$0.67 \times 30 = 20\%$$
=> Ans - (B)
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