It's Lean System class. Need to be done within next 6 hrs

This Question need to be solved in word document.

I also provide the pictures of the examples that on the question.

Develop another plan for the Mexican roofing manufacturer described in Examples 1 to 4 (pages 538 – 542 ) and Solved Problem 13.1 (page 554 ).

a) For this plan, plan 5, the firm wants to maintain a constant workforce of six, using subcontracting to meet remaining demand. Is this plan preferable?

b) The same roofing manufacturer in Examples 1 to 4 and Solved Problem 13.1 has yet a sixth plan. A constant workforce of seven is selected, with the remainder of demand filled by subcontracting.

c) Is this better than plans 1–5?