$$\frac{80}{100}\times3.4$$
$2.72$
$$\frac{4}{5}\times 3.4$$
$$\frac{4}{5}\times \frac{17}{5}$$
$$\frac{4\times 17}{5\times 5}$$
$$\frac{68}{25}$$
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$\frac{17 \cdot 2 ^ {2}}{5 ^ {2}} = 2\frac{18}{25} = 2.72$