Answer:
$11,000
Step-by-step explanation:
The computation of the monthly increase in operating income is shown below:
= Sales volume × contribution margin ratio - additional spending done on the direct mail advertising
= $45,000 × 40% - $7,000
= $18,000 - $7,000
= $11,000
We simply applied the above formula so that the monthly increase in operating income could be determined.