Could you help with this problem? Step by step instructions would be helpful. For the base case in this section, as a percentage of sales, COGS = 70%, SGA = 15%, R&D is 2.4% Depreciation, interest expense are fixed as stated, tax is 20%. #1 al Given the following case, calculate the independent effects of a 1% increase in Gross Margin, a 1% decrease in Tax Rate and a 5% increase in Sales. Sales Cost of Goods Sold SGA Depreciation R&D Total Costs & Expenses Operating Income Interest Expense Earnings Before Taxes Provisions for Taxes Net Income base cost 21 10 1477 3 17 160 51 2005 105 39 66 13 53 1% Increase in Gross Margin 1% Decrease in Tax Rate 5% Increase in Sales