Solve the problem using Solver. What is the least expensive shipping plan to fill the demands at the stores? If your answer is zero, enter $"0".$

Warehouse $1234$

$1$

$2$

$3$

The minimum total cost is $

$.$

d$.$ Suppose that shipments are not allowed between warehouse $1$ and store $2$ or between warehouse $2$ and store $3.$ What is the easiest way to modify the spreadsheet so that you can solve this modified problem?

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