Maine has one of the lowest sales tax rates in the country. if an item costs $40, you will pay $2 in sales tax. what percent of sales tax will you pay?

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.