PLEASE HELP

649 Interest Rate Debt Principal $18,000 Repayment Period 10 years Payment Interval 6 months Conversion Period semi-annually Outstanding Principal After: 6th payment 11% (a) The size of the periodic payment is $ 1506.23 (Round the final answer to the nearest cent as needed. Round all intermediate values to six decimal places as needed.) (b) The outstanding principal after the 6th payment is $ (Round the final answer to the nearest cent as needed. Round all intermediate values to six decimal places as needed.) (c) The interest paid by the 7th payment is $ (Round the final answer to the nearest cent as needed. Round all intermediate values to six decimal places as needed.) (d) The principal repaid by the 7th payment is $ (Round the final answer to the nearest cent as needed. Round all intermediate values to six decimal places as needed.)