Your worksheet "SOLVER" should look like:

$\backslash$table$[[$A$,,$c$,$D$,$E$,$F$,$G$],[$Table $1$: Financial results for August $2019(000),,,],[,$REVENUE,August,September,October,November,December$],[\frac{?}{\text{b}\text{a}\text{r}}(1),$Wedding Invitations,$4,507,4,704,4,910,5,126,5,360],[2,$Birthday Party Invitations,$3,841,4,206,4,606,5,044,5,524],[3,$Business Party Invitations,$2,652,2,780,2,913,3,053,3,200],[4,$TOTAL SALES REVENUES,$11,000,11,690,12,430,13,223,14,074],[5,$EXPENSES,,,,,$],[6,$Printing Costs,$4,400,4,676,4,972,5,289,5,630],[7,$Salaries,$3,500,3,500,3,500,3,500,3,500],[8,$Administration,$550,585,622,661,,704],[9,$Advertising,$1,544,1,609,1,677,1,747,1,821],[10,$Legal Fees,$788,,826,865,907,950],[11,$Shipping,$928,978,1,030,1,085,1,143],[12,$TOTAL EXPENSES,$11,710,12,173,12,665,13,190,13,748],[13,$Net Income before Taxes,$-710,-10,-483,-235,34,327],[14,$Taxes,$0,0,0,9,91],[14,$Net Profit $($loss$),-710,-483,-235,24,235],[$#$,$PROJECTED GROWTH PER Md$,\%,,,,],[2,$Wedding Invitations,$4\mathrm{.}38,,,,],[3,$Birthday Party Invitations,$9\mathrm{.}51,,,,],[4,4-2\mathrm{.}2.,$Business Party Invitations,$4\mathrm{.}81,,,,],[5,$Advertising,$4\mathrm{.}21,$SOLVER,,,$],[6,$Legal Fees,$4\mathrm{.}79,$GOAL,,,$],[7,$Shipping,$5\mathrm{.}35,,,,],[,$December Increase Goal,$19\mathrm{.}85,281\mathrm{.}93,,,]]$

Use the NET Profit value for December $($cell G$20)$ and calculate your objective value for improved December result. The increase $\%$ for your group is in column G $($see Table $2$ Group Assignment above$).$ Store the desired value in cell D$30.$

Use Excel Solver to manipulate projected growth per month $($cells C$24$:C$29)$ to achieve the December goal calculated and stored in cell D$30.$

Save the Solver solution.