I need A$-$C answered thanks $8.$ Amir wants to determine how the sales of each month contributed to the total sales. Calculate this information for him as follows: a$.$ In cell B$12,$ insert a formula without using a function that divides the total sales for July $($cell B$9)$ by the total sales $($cell I$9).$ b$.$ Use an absolute reference to cell $19$ in the formula. c$.$ Use the Fill Handle to fill the range C$12$:G$12$ with the formula in cell B$12.$