Write a real word problem in which you would need to compare initial values for three linear functions

Can this be an answer?

Urpi wants to buy towels online. There are two stores with the kind of towel she wants.

The first store charges $20 $20 dollar sign, 20 per towel, and the delivery charge is \$25 $25 dollar sign, 25.

The following equation gives the total price (in dollars) of an order from the second store (including delivery) as a function of the number of towels:

P =35+18nP=35+18nP, equals, 35, plus, 18, n

Which store charges more per towel?

A: The first store

B: The second store

C: They both charge the same amount per towel

Urpi needs 151,515 towels. Which store is cheaper for her?

A: The first store

B: The second store

C: Urpi's order costs the same at both stores

By the way, I found this on Khan Academy

Hope this helps ^_^  :3