6. a. Determine the monthly payment for an $9,000, 3 year, discounted loan at 6%. b. Determine the total interest charge for this loan. c. Determine the actual cash received when this loan is granted. 7. Determine the present value of an annuity due in which $20 is deposited at the beginning of each month for 15 years at 2% compounded monthly. 8. Mr. Gouzien deposits $20 at the beginning of each week in an account at 5% annual interest compounded weekly. How much money will he have to spend on holiday gifts when he takes the money out at the end of 48 weeks