A phone company charges customers a fixed 40 dollar service fee plus $0.10 per megabyte of data used, up to a cap of 500 megabytes. If a customer exceeds a 500 megabyte limit, then the company charges $0.50 per megabyte for any additional data used. a. Graph a function modeling this scenario. Clearly define all variables and label your graph. b. Write the piecewise function for total phone bill based on the number of megabytes a customer uses. c. What is the cost if a customer uses 600 megabytes in a month?

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