Pizza Express offers large pepperoni pizzas for $5 on Tuesdays from 5:00 to 9:00 in the evening. Three cooks are on duty during that time. The fixed cost for the four-hour period is $100. The variable cost is $2 per pizza.
a. If it takes 10 minutes to prepare each pizza, worker efficiency is approximately 95% and employees get a 10- minute break each hour, how many pepperoni pizzas can Pizza Express produce during its four-hour special?
b. Assuming all pizzas produced can be sold, is the promotion worth the effort?