A phone company charges its customers $50 or the first 500 minutes used each month. For any additional minutes used over the 500, the customer is charged an additional $.10 per minute. Find the piecewise function that describes this situation. Of (z) = 50 m 500 O 50 m 500 Of ( z) -50 50 + .1m m 500 O 50 + .1(m - 500) m 500