How much interest will $10,000 earn in 9 months at an annual rate of 4%?
Choose the correct choice:  A) $ 300  B) $ 350  C) $ 450  D) $ 550  E) $ 650

Rationale: soln : - 9 months = 3 / 4 of year ; 4 % = 4 / 100 = 1 / 25 ; $ 10,000 ( principal ) * 1 / 25 ( interest rate ) * 3 / 4 ( time ) = $ 300 . answer : a
Answer: A