#s A large retailer of boots assembled the information shown below for the quarter ended June 30: Total sales revenue $200,000 Selling price per pair of boots $800 Variable selling expense per pair of boots $300 Variable administrative expense per pair of boots $20 Total fixed selling expense $30,000 Total fixed administrative expense $20,000 Beginning merchandise inventory $30,000 Ending merchandise inventory $40,000 Merchandise purchases $100,000 What would have been an effect on net operating income if the firm had sold 70 pairs of boots more than it did? a. $5,600 increase b. $8,400 increase c $24,400 increase d. $33,600 increase e. None of the above