Answer:
It increases by 50 units.
Explanation:
Current break even point = [tex]\frac{Fixed\:Cost}{Contribution\:per\:unit}[/tex]
Here, fixed cost = $4,500
Contribution per unit = Selling price - Variable Cost = $20 - $10 = $10
Current break even point = [tex]\frac{4,500}{10} = 450 units[/tex]
If variable cost increase by 10% then revised variable cost = $10 + 10% = $11
Contribution per unit = $20 - $11 = $9 per unit
Break even sales in units = [tex]\frac{4,500}{9} = 500 units[/tex]
Difference in original and revised break even = Revised - Original = 500 - 450 units = 50 units,
Thus original break even increases by 50 units, = 50/450 = 11.11% increase.
Final Answer
It increases by 50 units.