If I charged 30$ a hair cut the whole year how many customers would I need?and how many times would each customer have to come in in order for me to get 17,510$ with in that year step by step please I need this solved

One cell phone plan charges $20 per month plus $0.15 per minute used. a second cell phone plan charges $35 per month plus $0.10 per minute used. write and solve an equation to find the number of minutes you must talk to have the same cost for both calling plans.