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Common$-$size and trend percentages for a company's net sales, cost of goods sold, and expenses follow:

$\backslash$table$[[,$Common$-$Size Percentages,,Trend Percentages$],[$Net sales,$2023,2022,2021,2023,2022,2021,],[$Cost of goods sold,$100\mathrm{.}0\%,100\mathrm{.}0\%,100\mathrm{.}0\%,108\mathrm{.}2\%,106\mathrm{.}8\%,100\mathrm{.}0\%,],[$Expenses$,68\mathrm{.}5,65\mathrm{.}3,62\mathrm{.}5,114\mathrm{.}4,110\mathrm{.}4,100\mathrm{.}0,],[,21\mathrm{.}2,17\mathrm{.}5,19\mathrm{.}5,112\mathrm{.}6,105\mathrm{.}3,100\mathrm{.}0,]]$

Required:

a$.$ Calculate the profit percentage for $2021,2022$ and $2023.($Round the final answers to $2$ decimal places.$)$

$\backslash$table$[[,$Profit Percentage$],[2021$