Family Home & Security, Inc., sells Super padlocks. lt reported an increase in net sales from $4.2 billion in 2014 to $4.5 billion in 2015, and an increase in gross profit from $1.2 billion in 2014 to $1.4 billion in 2015 1. Calculate each year's gross profit percentage. (Round your answers to 1 decimal place.) 2015 2014 Gross Profit Percentage 2. Determine whether the change in gross profit represents O a decrease in gross profit per sale. O an increase in sales volume. O a decrease in gross profit per sale and an increase in sales volume