help me solve For the base case in this section, as a percentage of sales, COGS$=72$ percent, SGA$=15$ percent, $R$&$D=2\mathrm{.}5$ percent. Depreciation,

Interest expense are fixed as stated. Tax Rate is $20$ percent.

$1.$a

Given the following case, calculate the independent effects of a $1$ percent increase in Gross Margin, a $1$ percent decrease in the

TaxRate, and a $5$ percent increase in Sales.

Colossal Chemical Corporation

Year Ended December $31,2021$

omitted$)$