E 5-18 Solving for unknown annuity payment; installment notes L05-9, 105-10 Don James purchased a new automobile for $20,000. Don made a cash down payment of $5,000 and agreed to pay the remaining balance in 30 monthly installments, beginning one month from the date of purchase. Financing is available at a 24% annual interest rate. Required: Calculate the amount of the required monthly payment