what is rate of interest if principal.amount be 400,simple interest 100 and time 2year.
Select.
A) 10  B) 12.5  C) 25  D) 12  E) 14.5

Rationale: "s . i = ( p * r * t ) / 100 100 = 800 r / 100 r = 100 / 8 = 12.5 % answer b"
Answer: B