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C. Write a piecewise function for the given situation: The School GPTA officers want to give t-shirts to all the students for the foundation day. They found a supplier that sells t-shirts for P180 per piece. The supplier agreed to give the t-shirt for P145 for a bulk order of 100 shirts or more. Use a piecewise function to express the cost in terms of the number of t-shirt purchases. (3 pts)​