Bill and jose are going to order t-shirts for their school clubs. the t-shirts will have the club
logo printed on the front. bill asks two local t-shirt companies to give him a price.
paula's printing charges $21.50 for each t-shirt.
shantay's shirts has a one-time set-up fee of $63 and then charges $18 for each t-shirt.

bill needs to order 30 t-shirts for his club. which company should bill choose to
spend the least amount of money? use math to justify your recommendation.