What sum of money will produce Rs.90 as simple interest in 4 years at 4 1/2 percent?	Choose the correct option.
A) rs . 550 B) rs . 650 C) rs . 600 D) rs . 500 E) rs . 700

Rationale: "explanation : 90 = ( p * 4 * 9 / 2 ) / 100 90 = 36 p / 100 p = 500 answer : option d"
Answer: D