Answer:
a. 24%
b. $600
Step-by-step explanation:
The computation is shown below:
a. The contribution margin ratio is
= (Sales - variable cost) ÷ (Contribution margin) × 100
= ($283,000 - $215,080) ÷ (283,000) × 100
= ($67,920) ÷ (283,000) × 100
= 24%
b. Now the estimate change in the net operating income is
= Increase in total sales × contribution margin ratio
= $2,500 × 24%
= $600
The fixed cost remain unchanged