please help with the following question:

Given the assumptions below:

A. Calculate the Contribution Margin as a dollar amount

B. Calculate the Contribution Margin as a percentage

C. Calculate Operating Income

1. Net Revenues		750,000
2. Variable Costs		425,000
3. Fixed Costs		180,000

A.

Calculate the Contribution Margin as a dollar amount

B. Calculate the Contribution Margin as a percentage

C. Calculate Operating Income ____

D. Calculate Break Even Revenues