Spreadsheet Modeling and Decision Analysis Problem

Eric Brown is responsible for upgrading the wireless network for his employer. He has identified seven possible locations to install new nodes for the network. Each node can provide service to different regions within the corporate campus. The cost of installing each node and the regions that can be served by each node are summarized:
Node 1: Regions 1,2,5 Cost $700
Node 2: Regions 3,6,7 Cost $600
Node 3: Regions 2,3,7,9 Cost $900
Node 4: Regions 1,3,6,10 Cost $1250
Node 5: REgions 2,4,6,8 Cost $850
Node 6: Regions 4,5,8,10 Cost $1000
Node 7: Regions 1,5,7,8,9 Cost $1100

Formulate an ILP for this problem
Implement your model in a spreadsheet and solve it
What is the optimal solution?