Reema took a loan of Rs 800 with simple interest for as many years as the rate of interest. If she paid Rs. 632 as interest at the end of the loan period, what was the rate of interest.  Choose the correct answer.
A) 8.62 %
B) 8.88 %
C) 8.32 %
D) 8 %
E) 9 %

Rationale: "explanation : let rate = r % then time = r years . = > 800 ∗ r ∗ r / 100 = 632 = > r 2 = 79 = > r = 8.88 % option b"
Answer: B