please explain procedure thanks

lululemon athletica inc. reported the following information (in US$ thousands) for the three fiscal years ended: January 29, 2017 January 31, 2016 Net sales January 28, 2018 $2,649,181 1.250,391 456,001 258,662 Cost of goods sold Profit from operations Profit $2,344,392 1,144.775 421.152 303,381 $2,060,523 1,063,357 369.076 266,047 Calculate the gross profit margin and profit margin for lululemon for each of the three years. (Round answers to 1 decimal place Pg. 52.7%) 2018 2017 2016 % % % Gross profit margin 9 % % Profit margin Recalculate profit margin using profit from operations as opposed to profit. (Round answers to 1 decimal place, eg. 527%) 2018 2017 2016 Profit margin (Profit from operations) % % % Comment on whether the ratios improved or weakened over the three years. Gross profit margin Profit margin (Profit from operations) V