EPiano Makes Electronic Keyboards

Multiple Choice

ePiano makes electronic keyboards. The practice model price is $220, and its variable expenses are $190. The deluxe model price is $340, and its variable expenses are $250. The professional model price is $1,200 and its variable expenses are $800. Total fixed expenses are $187,000. In general, ePiano sells six practice models and three deluxe models for every professional model sold.
-Refer to the Figure.What is the total contribution margin of six practice models,three deluxe models,and one professional model?

A) $450
B) $520
C) $587
D) $850