Comparative statements Tol Sales Cost of goods sold Gross profit Operating expenses Operating income ABC Corporation Comparative Income Statements For the years ended December 31 2018 $14,800 8,225 6,575 3,664 $ 2.911 2017 $13,229 8.661 4,568 3,576 $ 992 2016 $13,994 8,375 5,619 3,487 $ 2.132 Required: 1. Calculate trend percentages for (a) sales, (b) gross profit, (c) operating income Use 2016 as the base year. (You must show your detailed work.) 2. Use 2016 as the base year, comment on the results