Answer:
0.25 or 25 %
Step-by-step explanation:
Contribution Margin ratio is defined as contribution expressed as a percentage or decimal of the sales revenue.
Where
Contribution = Sales - Variable Cost
= $4 - $3
= $ 1
Therefore,
Contribution Margin ratio = Contribution ÷ Sales
= ($4 - $3) ÷ $3
= 0.25 or 25 %