Fluctuation, Inc., recorded the following profit figures in 2008-2010 2009 2008 2010 $30,500 Net sales Costs and expenses Cost of products sold Selling General Research and development $25,600 $22,900 $12, 600 10,300 5,025 2,325 3,190 $27,525 S20, 840 $ 4,760 $ 8, 350 4,580 2,150 2,840 $17,920 $ 4,980 300)(400) $ 4, 580 7,875 2,950 4,100 Operating income Other income (expense) Earnings before tax Income tax Net income s 2,975 525 $ 3,500 1,480 s 2,020 $ 4,460 1,990 s 2,470 s 2,480 Required a. Compute the net profit margin for 2008-2010 b. Compute the gross profit margin for 2008-2010 c. Describe the trend in profitability and pinpoint its causes