1. Rachel runs her own hot dog stand on the U of A Campus. The monthly cost of the cart rental and business permit is $300. Rachel's contribution margin per unit is $1.50. She has recently added individual servings of potato chips to her product offering. Each bag of potato chips has a contribution margin of $0.75 per bag. Rachel sells 5 bags of potato chips for every 10 hot dogs. a. What is Rachel's weighted average contribution margin per unit? b. How many total units must Rachel sell in a month to earn a target monthly profit of $900? c. Of the total units needed to earn $900 of profit, how many are hot dogs and how many are bags of potato chips