The following information is given for Kwan-Cook, Inc.:

Unit sales price $10

Variable cost per unit $6

Total fixed costs $50,000

Determine the following:

a Contribution margin per unit

b Contribution margin ratio

c Break-even sales in units

d Break-even sales in dollars

e Sales in units required to achieve a net income of $4,000

f Sales in units required to achieve a net income of 155 of sales