Answer:
a. Contribution margin = Selling price - Variable cost per unit
Contribution margin = $15 - $10
Contribution margin = $5 per unit
Break even point in units = Fixed cost / Contribution margin
Break even point in units = $1,750,000 / $5
Break even point in units = 350,000 units
b. Required sale = Fixed cost + Target profit / Contribution margin
Required sale = $1,750,000 + $400,000 / $5
Required sale = $2,150,000 / $5
Required sale = 430,000 units