For the base case in this section, as a percentage of sales, COGS =70 percent, SGA = 15 percent, R&D=2.4 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 (\$000,000 omitted) 1.b Using the same case, calculate the independent effects of a 2 percent increase in Gross Margin, a 2 percent decrease in the Tax Rate, and a 5 percent decrease in Sales. Colossal Chemical Corporation Year Ended December 31, 2021 (\$000,000 omitted)