Given Principal $13,500, Interest Rate 6%, Time 240 days (use ordinary interest) Partial payments: On 100th day, $5,200;0180 th day, $3,100 a. Use the U.S. Rule to solve for total interest cost. Note: Use 360 days a year. Do not round intermediate calculations. Round your answer to the nearest cent. b. Use the U.S. Rule to solve for balances. Note: Use 360 days a year. Do not round intermediate calculations. Round your answers to the nearest cent. c. Use the U.S. Rule to solve for final payment. Note: Use 360 days a year. Do not round intermediate calculations. Round your answer to the nearest cent