PLEASE PROVIDE THE STEPS and formulas used to get the answer!! Thank you!!

Mr. Tiger is a very popular car wash. It offers high-speed car wash services at a reasonable price, so it always has unlimited demand. The service process includes five activities that are conducted in the sequence described below. (The time required for each activity is shown in parenthesis): - Activity 1: Greet customer and explain the selection of services. (1 minute) - Activity 2: Process payment. (1 minute) - Activity 3: Wash the car. (1 minute) - Activity 4: Rinse and dry the car. (2.5 minutes) - Activity 5: Apply polish. (0.5 minutes) Three servers (S1, S2, and S3) offer the services in a worker-paced line. The assignment of tasks to servers is the following: S1 does Activity 1 . S2 does activities 2 and 3 . S3 does activities 4 and 5 . If you let go of one of the three original employees and reassign the tasks so that the first employee does activities 1, 2, and 3, and the second employee does activities 4 and 5 , what is the new cost of direct labor per customer (with the same wage rate of $20 per hour per employee)? The new cost of direct labor is per customer