can someone please help solve this and show work? thank you so much

7. At a break-even point of 400 units sold, variable expenses were $4,000 and fixed expenses were $2,000. What will the 401st unit sold contribute to profit? a. $0 b. $5 c. $10 d. $15 Cannot be determined from information provided. e. a. 8. Danny's Consulting Company (DCC) bills clients by the hour. DCC bills clients $250 per hour of consulting provided. DCC has variable costs of $100 per hour. DCC has fixed costs of $300,000. How many hours must DCC bill to clients to break even? Cannot be determined with information provided. b. 1,200 c. 3,000 d. 2,500 e. 2,000 a. 9. Juliet's Children's Clothes Company (JCCC) has a target profit of $100,000. That profit requires unit sales to be 2,000. JCCC's variable cost per unit is $100 and fixed expenses are $50,000. If JCCC achieves that target profit, what is the margin of safety in units sold (round to nearest unit)? 1,333 b. 667 c. 2,000 d. 571 Cannot be determined from information provided. e