Arthur's Plumbing reported the following: Revenues $4,500 Variable manufacturing costs $ 900 Variable nonmanufacturing costs $ 810

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Question:

Arthur's Plumbing reported the following:
Revenues $4,500
Variable manufacturing costs $ 900
Variable nonmanufacturing costs $ 810
Fixed manufacturing costs $ 630
Fixed nonmanufacturing costs $ 545

Required:
a. Compute contribution margin
b. Compute contribution margin percentage
c. Compute gross margin.
d. Compute gross margin percentage.
e. Compute operating income.