Answer and Explanation:
As per the data given in the question, 
 
 Differential analysis 
 Continue cup(Alt. 1) Discontinue cups(Alt 2) 
 Particulars Alt 1 Alt 2 Differential 
 Effect on income 
Revenues $31,300 $0 $31,300 
Costs: 
Variable cost of goods sold $14,280 $0 $14,280 
 ($16,800×(100%-15%) 
Variable selling and admin expenses $10,020 $0 $10,020 
 ($16,700(100%-40%) 
Fixed cost $9,200 $9,200 $0 
 ($16,800×15%+$16,700×40%) 
Net income ($2,200) ( $9,200) ($7,000)