For the base case in this section, as a percentage of sales, COGS =70 percent, SGA = 14 percent, R\&D = 3.0percent. Depreciation. Interest expense are fixed as stated. Tax Rate is 20 percent. 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. Research and development Total costs and expenses Operating Income Interest expense Earnings before Income Taxes Provision for Income Taxes Net Income 63 $1,995$ 115 39 $76$ 15 $61$ $ $ $ $ s $