Ineed on this. answer if you understand

a. does the information on the sign represent a proportional relationship?

b. miguel selects five dvds to purchase. a few of the dvd cases appear to be damaged, so the manager gives miguel a 20% discount on his entire purchase. miguel tries to guess how much money will be deducted from the total cost. what is a reasonable estimate of the cost of the dvds before the tax is added?

explain by showing work you!