Check my work Given Principal: $8,500, 58, 240 days Partial payments On 100th day, $3,000 On 180th day. $2.100 a. Use the U.S. Rule to solve for total interest cost. (Use 360 days a year. Do not round Intermediate calculations. Round your answer to the nearest cent.) points eBook Total interest cost Print References b. Use the U.S. Rule to solve for principal balances. (Use 360 days a year. Do not round Intermediate calculations. Round your answers to the nearest cent.) On 10th day On 100th day Balance after the payment Next > 8 of 13