$$20 \frac { 1 } { 10 } + 30 \frac { 1 } { 20 } + 10 \frac { 1 } { 50 }$$
$\frac{6017}{100}=60.17$
$$\frac{200+1}{10}+\frac{30\times 20+1}{20}+\frac{10\times 50+1}{50}$$
$$\frac{201}{10}+\frac{30\times 20+1}{20}+\frac{10\times 50+1}{50}$$
$$\frac{201}{10}+\frac{600+1}{20}+\frac{10\times 50+1}{50}$$
$$\frac{201}{10}+\frac{601}{20}+\frac{10\times 50+1}{50}$$
$$\frac{402}{20}+\frac{601}{20}+\frac{10\times 50+1}{50}$$
$$\frac{402+601}{20}+\frac{10\times 50+1}{50}$$
$$\frac{1003}{20}+\frac{10\times 50+1}{50}$$
$$\frac{1003}{20}+\frac{500+1}{50}$$
$$\frac{1003}{20}+\frac{501}{50}$$
$$\frac{5015}{100}+\frac{1002}{100}$$
$$\frac{5015+1002}{100}$$
$$\frac{6017}{100}$$
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$\frac{11 \cdot 547}{2 ^ {2} \cdot 5 ^ {2}} = 60\frac{17}{100} = 60.17$
