Answer:
Operating income          $ 7860    if the    Round Trivia Game had not been produced or sold.
Explanation:
Blossom Trivia Co. Manufacturers
                       Square Trivia Game        Round Trivia Game     Total
 Sales revenue           $17,800                 $6,620                  $24,420 
Variable expenses        4,520                   2,900                     7,420 
Contribution margin      13,280                   3,720                  17,000 
Fixed expenses               2,900                  4,200                  7,100 
Operating income          $ 10,380             $(480 )               $ 9,900
40% of Round Game fixed Costs= 40 % of  4,200= $1680
Unavoidable fixed costs= 4200- 1680= $ 2520
Adding these unavoidable fixed costs to the Square Trivia Game would give the company an operating income of   $ 7860      
Blossom Trivia Co. Manufacturers
                       Square Trivia Game       
 Sales revenue           $17,800                  
Variable expenses        4,520                   
Contribution margin      13,280                   
Fixed expenses               2,900 + 2520= $ 5420                 
Operating income          $ 7860