The design capacity for engine repair in our company is 80 trucks per day. The effective capacity is 40 engines per day. The actual output is 36 engines per day. Calculate the utilization and efficiency of the operation, respectively. Select one: a. 45% & 50% b. 45% & 90% c. 55% & 90% O d. 45% & 10% e.55% & 10%