Answer
0.3235 or 32.35 %
Step-by-step explanation
Price per unit = $170
Contribution margin (Unit) = $55
Contribution margin (Unit)= Price per Unit - Variable Cost per unit
55 = 170 - VC
VC = $115 per Unit
Contribution Margin Ratio = (Sales – variable expenses) ÷ Sales
= (170 - 115) ÷ 170
= 0.3235 or 32.35 %