1. If the variable cost % is .60 , find the contribution margin %
2. Fixed costs= 400 , contribution margin % is .40. Find sales dollars needed to break even.
3. Fixed costs= 500 , contribution margin per unit =10. Find sales in units to earn a net income of 100.
4. Selling price per unit= 80 ; variable costs per unit= 60; fixed costs= 200.

Find the contrib. margin %.