Answer and Explanation:
The computation is shown below:
a. The manufacturing margin is
= Sales - variable cost of goods sold
= $468,926 - $221,229
= $247,697
b. The contribution margin is
= manufacturing margin - Variable selling and administrative expenses
= $247,697 - $53,981
= $193,716
c. The operating income is
= Contribution margin - fixed cost
= $193,716 - $788,14 - $33,064
= $81,838