Start Excel $$ completed. In cell E$15,$ by using cell references, calculate the benefit$-$cost ratio for project A$1.(1$ pt$.)$ To calculate the benefit$-$cost ratios for projects A$2,$ A$3,$ A$4,$ copy cell E$15$ and paste it onto cells E$16$:E$18.(1$ pt$.)$ In cells F$15$:F$18,$ determine which project$($s$)$ should be excluded from subsequent consideration. $(1$ pt$.)$ In cell E$21,$ determine which projects should be considered as the base alternative and the first$-$choice alternative. $(1$ pt$.)$ In cell E$22,$ by using cell references, calculate the benefit$-$cost ratio for the first increment. $(1$ pt$.)$ In cell E$23,$ determine whether the first increment is justified. $(1$ pt$.)$ In cell F$21,$ determine which projects should be considered as the current base alternative and the second$-$choice alternative. $(1$ pt$.)$ In cell F$22,$ by using cell references, calculate the benefit$-$cost ratio for the second increment. $(1$ pt$.)$ In cell F$23,$ determine whether the second increment is justified. $(1$ pt$.)$ In cell C$25,$ determine which project should be chosen. $(1$ pt$.)$ Save the workbook. Close the workbook and then exit Excel. Submit the workbook as directed.$$