Need help with 2019 COGS

Exercise 7 -The following are excerpts from Your Co's financial statements. Your Co. 2019 2018 2017 Net Sales 1,080.00 S 960.00 $ 880.00 COGS 500.00 460.00 440.00 Other Expenses 320.00 280.00 240.00 Cash 80.00 100.00 40.00 A/R 160.00 120.00 140.00 Inventory 200.00 180.00 180.00 Prepaid Insurance 20.00 40.00 40.00 Total Assets 460.00 440.00 400.00 a) Perform horizontal analysis below, using 2017 as the base year (100%). 2019 2018 2017 Net Sales 122.7% 109.1% 100.0% COGS 454.5% 104.5% 100.0% X Other Expenses 133.3% 116.7% 100.0% b) Perform vertical analysis below. using