For a monthly electric tariff, Tenaga Nasional charged 22 cents/kWh for the first 200 kWh usage, 33 cents/kWh for the next 100 kWh, 52cents/kWh for 300 kWh afterwards, and another 55 cents/kWh for the remainder electric usage. a) Construct the piecewise functions for the problem. b) Graph the piecewise functions. c) Find the electric charge that Amran must paid if he used 724 kWh in one month [8 Marks)