Reema took a loan of Rs 900 with simple interest for as many years as the rate of interest. If she paid Rs. 729 as interest at the end of the loan period, what was the rate of interest. Choose the correct choice from the following choices.
A) 5 %	B) 6 %	C) 7 %	D) 8 %	E) 9 %

Rationale: "explanation : let rate = r % then time = r years . = > 900 ∗ r ∗ r / 100 = 729 = > r 2 = 81 = > r = 9 % option e"
Answer: E