A local pizza shop has a membership program for frequent buyers. The membership costs $15 per month and members get a discounted price of $1.25 per slice of pizza. Austin purchased a membership to this pizza shop. How much would Austin have to pay the pizza shop if he bought 11 slices of pizza this month? What would be the monthly cost for xx slices of pizza?

i need Monthly cost with 11 slices:
and Monthly cost with x slices



Answer :