Given Principal $11,000, Interest Rate 128, Time 240 days (use ordinary interest) Partial payments: On 100th day, $4,600
On 180th day, $2,800
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.)
Total interest cost
b. Use the U. S. Rule to solve for balances. (Use 360 days a year. Do not round intermediate calculations. Round your
answers to the nearest cent.)
On 100th day
On 180th day
Balance after the payment