Answer the Following Questions Using the Information Below

Multiple Choice

Answer the following questions using the information below:
Nancy's Niche sells a single product. 8,000 units were sold resulting in $80,000 of sales revenue, $20,000 of variable costs, and $10,000 of fixed costs.
-To determine contribution margin use:

A) only variable manufacturing costs
B) only fixed manufacturing costs
C) both variable and fixed manufacturing costs
D) both variable manufacturing costs and variable nonmanufacturing costs