Answer:
$ 3,500 units
Step-by-step explanation:
Selling price per unit (next year): 
= $20 + 10 % of $20
= $22
 
Variable cost per unit (next year): 
= $20 × 30 % 
= $6
 
Contribution per unit (next year): 
= Selling price per unit (next year) - Variable cost per unit (next year). 
 = $22 - $6
 = $16 
 
Fixed expenses = $56,000
 
Break even point (in units): 
= Fixed expenses ÷ Contribution per unit. 
 = $56,000 ÷ 16
 = $ 3,500 units