solve: 2x + 20% of x = 12.1

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Solution

Given that $2 x + 20$ % $x = 12.1$
$\Rightarrow 2 x + (\frac{20}{100}) x = 12.1$
$\Rightarrow 2 x + \frac{x}{5} = 12.1$
$\Rightarrow \frac{11 x}{5} = 12.1$
$\Rightarrow x = 5.5$ .

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