Given Principal: $$8,500,5\%,240$ days

Partial payments: On $100$th day, $$3,000$

On $180$th 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.$)$

Total interest cost

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.$)$

c$.$ Use the U$.$S$.$ Rule to solve for final payment. $($Use $360$ days a year. Do not round intermediate calculations. Round your answer to

the nearest cent.$)$

Final payment