A person buys 15 pens for ₹100, and sells them at 13 pens for ₹100. What is the gain percentage?

A

$$13\frac{4}{13}$$ percent

B

$$15\frac{3}{13}$$ percent

C

$$13\frac{3}{13}$$ percent

D

$$15\frac{5}{13}$$ percent