Question : A boy buys candies at 6 for a rupee. How many candies should he sell for a rupee to earn a profit of 20%?
Option 1: 4
Option 2: 3
Option 3: 7
Option 4: 5
Correct Answer: 5
Solution :
The cost price of 6 candies = INR 1
So, cost price of one candy = $\frac{1}{6}$
It is given, Profit = 20% of cost price
= $\frac{20}{100} × \frac{1}{6}$
= $\frac{1}{30}$
So, the selling price = $\frac{1}{6}$ + $\frac{1}{30}$ = $\frac{5+1}{30}$ = $\frac{1}{5}$
$\therefore$ Number of candies to sell for INR 1 = 5
Hence, the correct answer is 5.
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