Return calculations For the investment shown in the following table, calculate the rate of return earned over the unspecified time period. (Click on the icon located on the top-right corner of the data table below in order to copy its contents into a spreadsheet.) Cash flow during period - $710 Beginning-of- period value $48.400 End-of- period value $40.800 The rate of return on the investment is %. (Round to two decimal places. If there is a loss, enter as a negative percentage.)