For the base case in this section, as a percentage of sales, COGS = 70 percent, SGA = 14 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 Tax Rate, and a 5 percent increase in Sales. Sales Colossal Chemical Corporation Year Ended December 31, 2021 ($000,000 omitted) Base Case 1% Increase in Gross Margin 1% Decrease in Tax Rate 5% Increase in Sales 2,110 Cost of goods sold 1,477 Selling, general, and 295 administrative expense Depreciation 160 Research and development 51 A