E13-6 Here are the comparative income statements of Delaney Corporation. DELANEY CORPORATION Comparative Income Statements For the Years Ended December 31 Net sales Cost of goods sold Gross profit Operating expenses Net income 2019 $598,000 477,000 121,000 80,000 $ 41,000 2018 $500,000 420,000 80,000 44,000 36,000 Exercise Instructions (a) Prepare a horizontal analysis of the income statement data for Delaney Corporation, using 2018 as a base. (Show the amounts of increase or decrease.) (b) Prepare a vertical analysis of the income statement data for Delaney Corporation for both years