b, d. g- h. k. Required: For each of the following situations, choose the graph from the group a-1 that best illustrates the cost pattern involved. Also, for each situation, identify the driver that measures activity output 1. The cost of power when a fixed fee of S500 per month is charged plus an additional charge of S0.12 per kilowatt-hour used 2. Commissions paid to sales representatives. Commissions are paid at the rate of 5 percent of sales made up to total annual sales of S500.000, and 7 percent of sales above $500,000