$$(2\times10^{4})+(3\times10^{2})+(5\times10)+(9\times1)+(8\times\frac{1}{10})$$
$\frac{101799}{5}=20359.8$
$$2\times 10^{4}+3\times 10^{2}+50+9+8\times \frac{1}{10}$$
$$2\times 10000+3\times 10^{2}+50+9+8\times \frac{1}{10}$$
$$20000+3\times 10^{2}+50+9+8\times \frac{1}{10}$$
$$20000+3\times 100+50+9+8\times \frac{1}{10}$$
$$20000+300+50+9+8\times \frac{1}{10}$$
$$20300+50+9+8\times \frac{1}{10}$$
$$20350+9+8\times \frac{1}{10}$$
$$20359+8\times \frac{1}{10}$$
$$20359+\frac{8}{10}$$
$$20359+\frac{4}{5}$$
$$\frac{101795}{5}+\frac{4}{5}$$
$$\frac{101795+4}{5}$$
$$\frac{101799}{5}$$
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$\frac{3 ^ {2} \cdot 11311}{5} = 20359\frac{4}{5} = 20359.8$
