Can you explain how to get the answer to C and D?

*I already understand A and B.

D-Inspection Department The three products, their processing sequence and the quantities manufactured per month for each product, are shown in the following table: Product Sequence of operations Quantity (Department processing Per months from left to right) Product 1 B-> D-> A-> C->D 10 Product 2 B-> C-> D-> C->D 50 Product 3 C->D 30 a. Calculate and draw a From-To table for all the departments. B D A 10, B 50, 10, 10, 50, 50, 30 D 10, 50, b. From the previous table, calculate the total flow between departments. Department A 10 50 10 Department B Department Department D 10 190 c. Draw an initial layout for the departments, in the following existing workshops: B D A d. If the distance between the centres of two adjacent rooms is 10 metre, calculate the score for your solution 190*10 +50*10+10-20 +1020 +10*100 = 1900+500+200+200+100 = 2900 UNITS'METRE LOWER SCORE IS BETTER D-Inspection Department The three products, their processing sequence and the quantities manufactured per month for each product, are shown in the following table: Product Sequence of operations Quantity (Department processing Per months from left to right) Product 1 B-> D-> A-> C->D 10 Product 2 B-> C-> D-> C->D 50 Product 3 C->D 30 a. Calculate and draw a From-To table for all the departments. B D A 10, B 50, 10, 10, 50, 50, 30 D 10, 50, b. From the previous table, calculate the total flow between departments. Department A 10 50 10 Department B Department Department D 10 190 c. Draw an initial layout for the departments, in the following existing workshops: B D A d. If the distance between the centres of two adjacent rooms is 10 metre, calculate the score for your solution 190*10 +50*10+10-20 +1020 +10*100 = 1900+500+200+200+100 = 2900 UNITS'METRE LOWER SCORE IS BETTER