Need step-by-step solution via Excel Solver. From Chapter 7.4 (Using BIP for Crew Scheduling: The Southwestern Airways Problem) of Introduction to Management Science: A Modeling and Case Studies Approach with Spreadsheets (Fredrick Hillier, 6th Edition.). Please do not respond just to say you cannot solve this, which delays others from answering. Many thanks.

The university is scheduling cleaning crews for its ten buildings. Each crew has a different cost and is qualified to clean only certain buildings. There are eight possible crews to choose from in this case. The goal is to minimize costs while making sure that each building is cleaned. The management science department formulated the following linear programming model to help with the selection process. Min 220x2 + 200x2 + 240x3+ 220x4 + 300x5 + 220x6 + 190x7 + 290 xg S.T.x1 + x2 + x3 + x7 2 1 (Building A constraint) x1 + x2 + x3 = 1 {Building B constraint} X6 + xg 1 [Building C constraint} x1 + x4 + xy 1 (Building D constraint x2 + xy = 1 {Building E constraint} x3 + xg > 1 [Building F constraint) *2 + x5 + xy 1(Building G constraint) x1 + x4 + x6 = 1 (Building H constraint} X1 + X4 + > 1 [Building I constraint) x1 + x2 + xy 2 1 (Building J constraint) X8 = 1, if crew jis selected 10, otherwise Set up the problem in Excel and find the optimal solution. a. What is the cost of the optimal crew assignment? Cost of optimal crew assignment b. Which crews are assigned to work? Crew 1 will Crew 2 will Crew 3 will Crew 4 will Crew 5 will Crew 6 will Crew 7 will Crew 8 will