Interpreting Horizontal Analysis results

Income Statement $($$M$)20212020\%$ ChangeNet Sales$250\mathrm{.}40220\mathrm{.}8013\mathrm{.}4\%$

Cost of Goods Sold

$131\mathrm{.}95123\mathrm{.}506\mathrm{.}8\%$Gross Profit$118\mathrm{.}4597\mathrm{.}3021\mathrm{.}7\%$SG&A Expenses$65\mathrm{.}5055\mathrm{.}3018\mathrm{.}4\%$Operating Income$52\mathrm{.}9542\mathrm{.}0026\mathrm{.}1\%$Interest Expense$13\mathrm{.}3010\mathrm{.}2030\mathrm{.}4\%$Income Tax Expense$12\mathrm{.}6011\mathrm{.}905\mathrm{.}9\%$Net Income$27\mathrm{.}0519\mathrm{.}9035\mathrm{.}9\%$

You have been analyzing your company's performance over the past few years and decided to conduct a horizontal analysis.$$ Your results are above.$$

$1.$ Some of the results are causing you concern.$$ What are these and why do they concern you?

$2.$ What caused your Net Income to increase so much more than the increase in Net Sales?