Don Williams received a memo requesting that he complete a trend analysis of the following numbers using 2015 as the base year. Sales Gross profit Net income 2018 2017 2016 2015 $ 430,000 $ 490,000 $510,000 $590,000 270,000 79,000 330,000 99,000 430,000 49,000 490,000 59,000 Could you help Don with the request? (Round your answers to the nearest whole percent.) Sales Gross profit Net income 2018 2017 2016 2015 96 %6 % % 96 % % % 96 % % %