A vendor bought 12 items for a rupee. How many for a rupee should he sell to gain 20%?

Correct option is B

Given:

Cost price (CP) of 12 items = ₹1
CP per item =$$\frac{1}{12}$$​ rupees
Gain = 20%

Formula Used:

SP per item $$= \text{CP per item} \times \left(1 + \frac{\text{Gain \%}}{100}\right)$$​

Solution:

SP per item =$$\frac{1}{12} \times \frac{120}{100} = \frac{1}{12} \times \frac{6}{5} = \frac{1}{10}$$​

He must sell each item at $$\frac{1}{10}$$​, i.e., 10 items for ₹1.

Answer: 10 items