16. Castle Co. reports net income of $100, net sales of $1,000, and cost of goods sold of $600. Which of the following is true of Castle? Return on sales = 10%; Gross profit percentage = 60% Return on sales 10%; Gross profit percentage = 40% Return on sales =910%; Gross profit percentage 60% %3D %3D %3D Return on sales = 40%; Gross profit percentage =140% %3