Please need help with 2. (c), (d), and (e)

If your formulas are correct, you should get the correct answers to the following questions. (a) What is the gross margin now? (b) What is the net operating income now? (c) What is the contribution margin now? 2. Suppose that sales are 13% higher as shown below: Enter this new data into your worksheet. Make sure you enter all of the new data - not just the sales. (a) What is the gross margin now? (b) What is the net operating income now? (c) What is the contribution margin now? (d) When sales increase by 13%, which of the following should also increase by 13% in a merchandising company? (You may select more than one answer. Single click the box with the question mark to produce a check mark for a correct answer and double click the box with the question mark to empty the box for a wrong answer. Any boxes left with a question mark will be automatically graded as incorrect.) Variable cost Fixed cost Gross margin Contribution margin Net operating income (e) When sales increase by 13\%, which of the following should increase by more than 13% in a merchandising company? (You may select more than one answer. Single click the box with the question mark to produce a check mark for a correct answer and double click the box with the question mark to empty the box for a wrong answer. Any boxes left with a question mark will be automatically graded as incorrect.) Variable cost Fixed cost Gross margin Contribution margin Net operating income