What is the rate percent when the simple interest on Rs.800 amount to Rs.160 in 5 Years?	Choose the correct answer
A) 5 % B) 7 % C) 9 % D) 2 % E) 4 %

Rationale: "160 = ( 800 * 5 * r ) / 100 r = 4 % answer : e"
Answer: E