Your cell phone plan costs $75 and includes unlimitedeverything except data (internet usages). Your plan only includes250mb of data. For the next 750mb it will cost you $0.10 per mb.For all usage over 1000mb it will cost you $0.15 per mb. a) Find the cost function. b) Graph the funtion. Your cell phone plan costs $75 and includes unlimitedeverything except data (internet usages). Your plan only includes250mb of data. For the next 750mb it will cost you $0.10 per mb.For all usage over 1000mb it will cost you $0.15 per mb. a) Find the cost function. b) Graph the funtion.