USE SOLVER

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Get Ready
Be sure Solver is installed on your system. If not, the Solver command will not appear on the Tools menu.
Identify the target cell you want to use with Solver. Note that this cell must contain a formula.
Example: C13 (Total Annual Profit)
Determine the result you’d like Solver to achieve.
Example: Maximize the profit
Locate the cells Solver can change to achieve your result.
Example: C5:C12 (contributors to profit)
Identify any constraints that Solver must respect.
Example: C11 must remain greater than 0

Begin
Display the Tools menu and then click the word Solver. The Solver Parameters dialog box will display.
Enter your target cell in the first field.
Select the option that matches the result you’d like to achieve.
Select the range Solver can change.
If you want, add any constraints.
Click the Solve button. The Solver Results dialog box will appear to allow you to keep the solution or restore the original values.