Luxury Goods Group, the Italian company that sells Ray Ban and Oakley sunglasses, reported net sales of 6.7 billion in 2014 and 77 billion in 2015. Gross profit increased to 3.3 billion in 2015 from 2.7 billion in 2014 1. Calculate the gross profit percentage for each year. (Round your answers to 1 decimal place.) 2014 2015 Gross Profit % 2. Was the increase in gross profit caused by an increase in gross profit per sale. an increase in sales volume. an increase in gross profit per sale and an increase in sales volume