please help with a and b, i need the excel formulas

You estimate that your cattle farm will generate $1 million of profits on sales of $4 million under normal economic conditions and that the degree of operating leverage is 8 . a. What will be the percentage change in profits if sales turn out to be $3.5 million? b. What will be the percentage change in profits if sales turn out to be $4.5 million? Note: Use cells A7 to B11 from the given information to complete this question. You should use the hardcoded number "1" in your formulas. No other hardcoded numbers may be used. A negative answer should be indicated by a minus sign