What is the rate percent when the simple interest on Rs.2000 amount to Rs.320 in 4 Years?	Choose one:
A) 4.5 %
B) 4.25 %
C) 4 %
D) 4.3 %
E) 4.1 %

Rationale: "interest for 1 year = 320 / 4 = 80 interest on rs 2000 p / a = 80 interest rate = 80 / 2000 * 100 = 4 % answer : c"
Answer: C