Magna International Inc. is a leading global supplier of technologically advanced automotive components, systems, and modules. Selected financial information (in US$ millions) follows:

		2017				2016				2015
Sales			$38,946				$36,445				$32,134
Cost of goods sold			33,258				31,123				27,559
Profit			2,206				2,031				2,013
Current assets			11,220				10,163				11,144
Current liabilities			9,169				8,695				7,276

(a) Calculate the gross profit margin, profit margin, and current ratio for each year. (Round Gross profit margin to 1 decimal place, e.g. 52.7% and all other answers to 2 decimal places, e.g. 52.75 or 52.75%.)

		2017			2016			2015
Gross profit margin			%			%			%
Profit margin			%			%			%
Current ratio			: 1			: 1			: 1