please help exercise 7-9

Exercise 7 Bruce Co. had sales per unit of $50 and variable costs per unit of $30. Its fixed costs total $2500. Calculate the following: Contribution margin per unit Contribution margin ratio Break-even point in units Break-even point in sales If Bruce Co. wants a target net income (TNI) of $5000, calculate: Sales required for TNI (in $) Exercise 8 Pat Co. had sales per unit of $40 and variable costs per unit of $30. Its fixed costs total $5000 and current sales total $25000. Calculate the following: Contribution margin per unit Contribution margin ratio Break-even point in units Break-even point in sales Margin of Safety If Pat Co. wants a target net income (TNI) of $6000, calculate: Sales required for TNI (in $) Exercise 9 Keegan Co. had sales per unit of $15 and variable costs per unit of $12. Its fixed costs total $6000 and current sales total $36000. Calculate the following: Contribution margin per unit Contribution margin ratio Break-even point in units Break-even point in sales Margin of Safety If Keegan Co. wants a target net income (TNI) of $18000, calculate: Sales required for TNI (in $)