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 here in order to copy the contents of the data table below into a spreadsheet.) \begin{tabular}{ccc} \hline \begin{tabular}{c} Cash flow \\ during period \end{tabular} & \begin{tabular}{c} Beginning-of- \\ period value \end{tabular} & \begin{tabular}{c} End-of- \\ period value \end{tabular} \\ \hline$4,040 & $45,700 & $40,500 \\ \hline \end{tabular}