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[tex]x + 10\%x = 110\%x \\ \\ 100\%x + (100\%x \times 10\%) = 13.31 \\ \\ \frac{100x}{100} + ( \frac{100x}{100} \times \frac{10}{100} ) = 13.31 \\ \\ \frac{100x}{100} + \frac{11x}{100} = 13.31 \\ \\ 121x = 1331 \\ \\ x = 11 \: \: pretu \: initial[/tex]
[tex]13.31 - 11 = 2.31 \\ \\ \frac{2.31}{11} \\ = 0.21 \\ = 21[/tex]
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