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A certain cell phone company charges $40 for the first 500 minutes of a month. After that, each minute costs $0.20. Write a piecewise function

A certain cell phone company charges $40 for the first 500 minutes of a month. After that, each minute costs $0.20. Write a piecewise function that represents the cell phone bill amount according to how many minutes are used. ( 3 marks)

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