4. If a sinking fund is used to repay a $100000 loan using level payments of $9000 at the end of each year for 30 years. If the sinking fund has an effective interest of 4%, what is the effective rate of interest paid to the lender?

5. Jacob borrows $20000 at an annual effective discount rate of 4.8%. The loan is to be repaid by annual end-of-year payments for four years, the first three of which are for the amount $5645.75 and the time 4 payment is for $5645.72. Make an amortization schedule for this loan.

6. A loan of $1000 is being repaid with quarterly payments at the end of each quarter for five years at 6% convertible quarterly. Find the outstanding loan balance at the end of the second year.