Consider the following manufacturing process that has the products going through 2 work centers, R and S, to complete their production. Each of the 4 jobs, A, B, C, D must follow the same order through these 2 processes (work centers). The process times for these jobs at these work centers (in hours) are given below.

Processes (Work centers) \ Jobs	A	B	C	D
R	3	4	9	6
S	5	1	2	7

1. Determine the optimal sequence schedule for processing the jobs through both work centers, so that the makespan is minimized
2. What is the total time to finish all 4 jobs in both processing centers (optimal makespan)? You would need to draw the Gantt chart.