$$540\times\frac{80}{100}\times\frac{90}{100}$$
$\frac{1944}{5}=388.8$
$$540\times \frac{4}{5}\times \frac{90}{100}$$
$$\frac{540\times 4}{5}\times \frac{90}{100}$$
$$\frac{2160}{5}\times \frac{90}{100}$$
$$432\times \frac{90}{100}$$
$$432\times \frac{9}{10}$$
$$\frac{432\times 9}{10}$$
$$\frac{3888}{10}$$
$$\frac{1944}{5}$$
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$\frac{2 ^ {3} \cdot 3 ^ {5}}{5} = 388\frac{4}{5} = 388.8$
