The following information is obtained from the Answer and Sensitivity reports generated by Excel Solver.

$\backslash$table$[[$Name$,$Cell Value Formula,Status,Slack$],[$Order quantity,$275,$$$F$$$7$$$H$$$7$ Binding,$0],[$Inventory space $375,$$$F$$$5$$$H$$$5$ Not Binding $125,,],[$Assembly time,$1200,$$$F$$$6$$$H$$$6$ Binding,$0]]$

Final Shadow ConstraintAllowableAllowable

$\backslash$table$[[$Name$,$Value,Price,R$.$H$.$ Side,Increase,Decrease$],[$Order quantity,$275,-10,275,25,35],[\backslash$table$[[$Inventory$],[$space$]],375,0,500,1E+30,125],[$Assembly tin,,,$1200,125,100]]$

What would the profit be if the store had $100$ more feet of storage space?

The profit decreases by $$125$ for each extra feet, thus decreases by $$125,000.$

The profit increases by $$125$ for each extra feet, thus increases by $$125,000.$

The problem becomes infeasible. The new profit cannot be calculated.

The profit stays the same because even if the store had an extra $100$ feet storage space, the optimal solution would not change.