Hart Company Sold 5,000 Units for a Price of $50

Hart Company sold 5,000 units for a price of $50 per unit and had the following information:
If the sales price per unit were to increase by 10%,variable expenses were to increase by 12.5% and fixed expenses were to increase by 20%,what would be the new contribution margin?

A) $19 per unit.
B) $21 per unit.
C) $23 per unit.
D) $25 per unit.
Unit variable cost = $160,000/5,000;($50x1.1) - ($32x1.125) = $19