Cookie Monster opens a business selling cookies in IC. He plans on selling 4000 cookies for $1 each in his first month and, and he has the following costs. --Rental of sales table: $500 per month --Baker's wage: $0.20 per cookie --Ingredients and packaging for cookies: $0.30 per cookie --Rental of Kitchen: $600 per month --Salespeople's salary $400 per month The unit contribution margin is: 1) $0.50 2) $0.70 O 3) $0.80 4) $0.90