A phone company advertises a new plan in which the customer pays a fixed amount of $25 per month for unlimited calls in the country, and $0.10 per minute for international calls. Find a rule in slope intercept form, y=mx+b, for the monthly payment a customer pays according to the new plan so that you can determine the monthly payment when a customer uses 150 minutes. What is the monthly payment for a customer that’s uses 150 minutes for international calls?