P8-2 Return cakulations For each of the investments shown in the following table, calcu late the rate of return earned over the unspecified time period. Cash flow Beginmingof Endof Investmentduringperiod pariod value pariod value S 100 118,000 48,000 S00 12,400 -$ 800 15,000 7,000 80 1,500 S 1,100 120,000 45,000 600 12,500