Tabs $3,8,18-2,27-2,$ and $86-2$ contain:

Input variables.

Complete all gray cells

Many of the cells have been pre$-$filled $($yellow$).$ Because some of these cells contain formulas based on already provided data and rely on your calculations, do not change these.

Do not change the formatting of any cells. Do not add any rows, columns or cells.

If a calculation or function is needed or appropriate, enter it where needed. This will help identify any errors or miscalculations and improve your learning experience.