Answer:
40%
Step-by-step explanation:
The computation of contribution margin ratio as given below :-
Variable cost
= $70 - $10
= $60
Selling Price = $100
contribution margin ratio
= (selling price - variable cost) ÷ selling price
= ($100 - $60) ÷ 100
= $40 ÷ 100
= 40%
Therefore for calculating the contribution margin ratio simply we deduct the variable cost from the selling price and divide by selling price.