\frac{12,75+1\frac{2}{3}*(-1,4)}{2,2+6\frac{2}{15}}=\frac{12,75-\frac{5}{3}*\frac{14}{10}}{\frac{22}{10}+6\frac{2}{15}}=
\frac{12\frac{3}{4}-\frac{7}{3}}{2\frac{1}{5}+6\frac{2}{15}}=\frac{12\frac{3}{4}-2\frac{1}{3}}{2\frac{3}{15}+6\frac{2}{15}}=\frac{12\frac{9}{12}-2\frac{4}{12}}{8\frac{5}{15}}=
\frac{10\frac{5}{12}}{8\frac{1}{3}}=\frac{125}{12}*\frac{3}{25}=\frac{5}{4}=1,25
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20\%*1,25=0,2*1,25=0,25