Answer:
d. 52% and $11 per unit
Step-by-step explanation:
Units sold (n) = 25,000
Selling price (P) = $21
Sales Revenue (S) = $21 x 25,000 = $525,000
Variable costs per unit (VCu) = $10
Total Variable costs = $10 x 25,000 = $250,000
Fixed costs (FC) = $75,000
The contribution margin ratio (CMR) is defined as:

The unit contribution margin (UCM) is the difference between the sales contribution per unit (P) and the variable cost per unit (VCu)

Therefore, the answer is alternative d. 52% and $11 per unit