Net sales, net income, and total asset figures for Vibrant Controls, Inc., for five consecutive years are given below (Vibrant manufactures pollution controls): Annual Amounts (Thousands of Dollars) Year 1 Year 2 Year 3 Year 4 Year 5 Net sales$71,500 $79,800 $85,275 $88,400 $94,700 Net income 3,200 3,650 3,900 4,250 4,790 Total assets 42,500 46,200 48,700 51,000 54,900 Required a. Calculate trend percentages, using Year 1 as the base year. b. Calculate the return on sales for each year. a. Round answers to one decimal point. Trend Percentages Year 2 Year 3 Year 4 Year 5 Net sales Net income Total assets