Greene Incorporated expeects to maintain the same inventories at the end of the year as at the beginning of the year. The estimated fixed costs for the year are $275,000, and the estimated variable costs per unit are $15. It is expected that 60,000 units will be sold at a price of $25 per unit. Maximum sales within the relevant range are 65,000 units.

Determine the following measures:

Contribution margin ratio

unit contribution margin

break even point in units

margin of safety