Computing the cost of a bank loan

Cintas Co. wants to borrow $500,000 on an add-on basis at a simple rate of 4.00% to be paid in nine monthly installments. Cintas Co. will receive the $500,000 upon approval of the loan and will pay back the principal and interest over the life of the loan. Calculate the monthly interest payment, the monthly principal payment, the approximate annual percentage rate (APR), and the approximate effective annual rate (EAR) of this add-on loan