The following ratios have been calculated for the Gracenat Company. Note that Gracenat has NO DEBT. Gross profit margin Operating profit margin Net profit margin 2020 2019 2018 42.0% 42.2% 42.1% 15.7% 21.7% 21.5% 11.8% 13.0% 12.9% a) Calculate the 2018 - 2020 Gross Profit Margin CAGR, the 2018 - 2020 Operating Profit Margin CAGR, and the 2018 - 2020 Net Profit Margin CAGR. (calculate the three CAGRS) b) Given the Operating Profit Margin CAGR in "a" above, what is your best guess of what happened? c) Given the OPM CAGR AND the NPM GAGR, what is your best guess of what happened? Keep in mind Gracenat has NO DEBT.