a. b. C. d. a. b. Heather Manetta is a hotdog vendor. She sells hotdogs for $10 each and has unit variable costs of $6. She pays $2,000 rent per month. On average, she sells 1,500 hotdogs per month. C. Calculate Heather Manetta's contribution per unit. Calculate Heather Manetta's total contribution per month. Harvey's Doughnuts has variable costs of $0.25 per doughnut and sells these for $1.50 each. His fixed costs are $10,000 per month. He sells an average of 9,500 doughnuts per month. Calculate Heather Manetta's break-even quantity. Calculate Heather Manetta's average profit per month. Calculate the unit contribution Harvey's Doughnuts. Calculate the number of doughnuts the firm has to sell each month in order to reach break-even. Calculate the monthly safety margin for Harvey's Doughnuts.