# A boy purchases bananas at the 11 bananas in 10 rupees and sells rate of 10 bananas in 11 rupees :

A boy purchases bananas at the 11 bananas in 10 rupees and sells rate of 10 bananas in 11 rupees. What is the percentage of profit to the boy?

(a) 10%

(b) 11%

(c) 21%

(d) 31%