What is the rate percent when the simple interest on Rs.4000 amount to Rs.640 in 2 Years?
Pick.
A) 8.2 %	B) 8 %	C) 8.5 %	D) 9 %	E) 9.5 %

Rationale: "interest for 1 year = 640 / 2 = 320 interest on rs 4000 p / a = 320 interest rate = 320 / 4000 * 100 = 8 % answer : b"
Answer: B