8. Lindsey wants to determine how the sales of each month contributed to the total sales. Calculate this information for her as follows: a. In cell B13, insert a formula without using a function that divides the total sales for January (cell B10) by the total sales to date (cell I10). b. Use an absolute reference to cell I10 in the formula. c. Use the Fill Handle to fill the range C13:G13 with the formula in cell B13.