**A sum of Rs. 10 is lent by a child to his friend to be returned in 11 monthly instalments of Rs. 1 each, the interest being simple. The rate of interest is:** A) $$ 10{ 2 \\over 11} % $$ % B) $$ 21{ 9 \\over 11} % $$ % C) $$ 11{ 9 \\over 11} % $$ % D) $$ 9{ 1 \\over 11} $$ % Click Link for Answer