Answer:
a. 0.34 or 34 %
b. $11.22
c. $134,680
Step-by-step explanation:
Unit Contribution Margin = Sales per unit - Variable Costs per unit
 = $33.00 - $21.78
 = $11.22
Contribution margin ratio = Contribution ÷ Sales 
 = $11.22 ÷ $33.00
 = 0.34
Operating Income = Contribution - Fixed Cost
 = ($11.22 x 24,000 units) - $134,600
 = $134,680