Answer:
52,000 units
Step-by-step explanation:
Selling price = $35*40,000 = $1,400,000
Variable cost = $12 * 40,000 = $480,000
Contribution margin = $1,400,000 - $480,000 = $920,000
Fixed cost = Residual income + Contribution
Fixed cost = $920,000 - $229,600
Fixed cost = $690,400
Sales to earn residual income = [Fixed cost + Desired profit] / Contribution per unit
Sales to earn residual income = [$690,400 + $505,600] / $35 - $12
Sales to earn residual income = $1,196,000 / $23
Sales to earn residual income = 52,000 units