Use Holt$-$Winter$$s additive method to create a seasonal model that minimizes the MSE for the data set. Use Solver to determine the optimal values of alpha, beta, and gamma. You can initialize these values to $0.$

a$.$ What are the optimal values of alpha, beta, and gamma?

b$.$ What are the forecasts for each of the next $6$ months using this technique? Year Month Time Period COGS

$11121637$

$2225506$

$3326594$

$4421933$

$5523117$

$6626979$

$7728337$

$8828926$

$9925015$

$101028196$

$111124170$

$121225004$

$211324575$

$21435848$

$31535217$

$41632759$

$51736542$

$61836109$

$71940279$

$82037816$

$92136338$

$102237814$

$112339359$

$122434151$

$312539862$

$22650664$

$32748533$

$42845382$

$52943981$

$63041276$

$73144284$

$83246920$

$93347469$

$103443187$