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.) End-of Cash flow Beginning-of- period value during period period value - $710 $21.800 $16,700 The rate of return on the investment is%. (Round to two decimal places. If there is a loss, enter as a negative percentage.)