Mandy Moore is a restaurant manager, who works in Sleepy Owl Pub in Port Moody. She explains to her newly hired chef, William Guilford, that to calculate the food or beverage item$$s selling price he can use one of the following methods: the product cost percentage, contribution margin, or the product cost plus. The calculation methods, Mandy says, are different, but one element is used in all these formulas. Which one?

a$.$

Contribution margin

b$.$

Cost of food

c$.$

Food cost percentage

d$.$

Prime cost