$2\mathrm{.}1$ Use an IF function in cellE$10$ to calculate the price to charge per donut for order $1.$a$.$ Customer are charged $$\mathrm{.}50$ per donut unless they buy a dozen or more. In this case, they are charged $$\mathrm{.}40$ a donut.b$.$ Refer to the appropriate price in cells C$3$ and C$4$ for your"value$\_$if$\_$true" and"value$\_$if$\_$false" arguments.c$.$ Use absolute and relative references when appropriate.