Answer:
10$
Step-by-step explanation:
if they get 5$ bills in a day and will have 50$ that means it will take 10 days. (example 1)
if you have 10$ and something cost 5$ you want to buy 10 of it you're going to need 50$
(example 2)
so basically you need to devide 50 by 5 and add a dollor sign to it 10$
(example 3)