What is the rate percent when the simple interest on Rs.800 amount to Rs.160 in 3 Years?
Select: A) 5 % B) 6.6 % C) 9 % D) 2 % E) 4 %

Rationale: "160 = ( 800 * 3 * r ) / 100 r = 6.6 % answer : b"
Answer: B