<p dir="ltr"><img src="https://media.cheggcdn.com/media%2F555%2F555abc69-f6da-4d6f-9a7a-84a68d47bb5a%2Fimage.png" alt="Exercise #1: Phone Bill customer a fixed subscription fee of 50 Dirhams in addition to the charges per liter. Each liter of w" aria-describedby="d3f"/></p><p dir="ltr"/>Exercise #1: Phone