just need help figuering out the percentage and part b

Vertical Analysis of Income Statement Revenue and expense data for Innovation Quarter Inc. for two recent years are as follows: Current Year Previous Year Sales $405,000 $352,000 Cost of goods sold 275,400 221,760 Selling expenses 52,650 52,800 Administrative expenses 56,700 45,760 Income tax expense 8,100 14,080 a. Prepare an income statement in comparative form, stating each item for both years as a percent of sales. If required, round percentages to one decimal place. Enter all amounts as positive numbers. Innovation Quarter Inc. Comparative Income Statement For the Years Ended December 31 Current year Current year Previous year Amount Percent Amount $405,000 100% $352,000 275,400 221,760 Previous year Percent Sales Cost of goods sold Gross profit $ 129,600 $ 130,240 52,650 52,800 Selling expenses Administrative expenses 56,700 45,760 Ch 17-3 Exercises and Problems percent or sales. Irequire una percentages to one uecimal placer encerrar amounts as positive numbers. Innovation Quarter Inc. Comparative Income Statement For the Years Ended December 31 Current year Current year Previous year Previous year Amount Percent Amount Percent Sales $405,000 100% $352,000 Cost of goods sold 275,400 221,760 Gross profit $ 129,600 $ 130,240 52,800 Selling expenses Administrative expenses Total operating expenses 52,650 56,700 45,760 $ 109,350 98,560 Income from operations 20,250 31,680 Income tax expense 8,100 14,080 Net Income 12,150 $ 17,600 b. The vertical analysis indicates that the cost of goods sold as a percent of sales by 5 percentage points, while selling expenses by 2 percentage points, and administrative expenses by 1 percentage points. Thus, net income as a percent of sales by 2 percentage points