Yusuf signed up for a streaming music service that costs $7 per month. The service allows Yusuf to listen to unlimited music, but if he wants to download songs for offline listening, the service charges $0.50 per song. How much total money would Yusuf have to pay in a month in which he downloaded 45 songs? How much would he have to pay if he downloaded s songs? Cost for 45 songs:

Cost for s songs: