Answer:
This question is incomplete
Rephrase it
It’s would be 12.75 because when you add the 1 grandstand, 2 bleachers and the 3 box seats you get 47.25 and 60-47.25=12.75.
Shop #1 has the best price for 21 pizzas because it is $105, while Shop #2 costs $147 for 21 pizzas which is a lot more money. they would save $42, which is 147-105=42. hope this helps:)