what is rate of interest if principal.amount be 400,simple interest 80 and time 2year. Choose the correct choice from the following choices:
A) 10 B) 12.5 C) 25 D) 12 E) 14.5

Rationale: "s . i = ( p * r * t ) / 100 80 = 800 r / 100 r = 80 / 8 = 10 % answer a"
Answer: A