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need help with both Hw Questions for business math annuities chapter

This problem demonstrates the dependence of an annuity's present value on the size of the periodic payment. Calculate the present value of 30 end-of-year payments of: (Do not round intermediate calculations and round your final answers to 2 decimal places.) a. $1,400 b. $2,400 c. $3,400 Use a discount rate of 5.4% compounded annually. After completing the calculations, note that the present value is proportional to the size of the periodic payment. A 18-year loan requires month-end payments of $607.33 including interest at 8.8% compounded monthly. What is the balance on the loan after half of the payments have been made? (Do not round intermediate calculations and round your final answer to 2 decimal places.) Balance on the loan $