Sunshine Group, an Italian company that sells sunglasses, reported net sales of 9 billion in 2018 and 9.9 billion in 2017. Gross profit decreased from 4.6 billion in 2017 to 4.1 billion in 2018. 1. Calculate the gross profit percentage for each year. (Round your answers to 1 decimal place.) 2. The change in gross profit was caused by: Complete this question by entering your answers in the tabs below. Required 1 Required 2 Calculate the gross profit percentage for each year. (Round your answers to 1 decimal place.) ces Gross Profit 2018 2017 % Required 1 Required 2 > ces Complete this question by entering your answers in the tabs below. Required 1 Required 2 The change in gross profit was caused by: a decrease in gross profit per sale. Oa decrease in sales volume. Ja decrease in gross profit per sale and an decrease in sales volume