$$20 + 7 + \frac { 8 } { 200 } + \frac { 6 } { 2000 } =$$
$\frac{27043}{1000}=27.043$
$$27+\frac{8}{200}+\frac{6}{2000}$$
$$27+\frac{1}{25}+\frac{6}{2000}$$
$$\frac{675}{25}+\frac{1}{25}+\frac{6}{2000}$$
$$\frac{675+1}{25}+\frac{6}{2000}$$
$$\frac{676}{25}+\frac{6}{2000}$$
$$\frac{676}{25}+\frac{3}{1000}$$
$$\frac{27040}{1000}+\frac{3}{1000}$$
$$\frac{27040+3}{1000}$$
$$\frac{27043}{1000}$$
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$\frac{27043}{2 ^ {3} \cdot 5 ^ {3}} = 27\frac{43}{1000} = 27.043$
