Use the PV command to find the present value of each of the following future cash flows at a discount rate of 10% per year, compounded monthly: (Warning: Be sure to use the rate thats appropriate for the calculations in each part of this problem. Labels for data and calculated values must all be complete.) a. Monthly payments of $1,500 at the beginning of each month for the next six years b. Monthly payments of $1,500 at the end of each month for the next six years. c. Year-end receipts of $5,000 for each of the next five years.