Express the following rational numbers as decimal.
(a) $ \frac{1}{8} $
(b) $ \frac{12}{25} $
(c) $ \frac{9}{20} $
(d) $ \frac{1}{50} $
$ \begin{array}{l}
( a) \ \frac{1}{8} \ =\ 0.125\\
\\
\\
\\
( b) \ \frac{12}{25} \ =\ 0.48\\
\\
\\
\\
( c) \ \frac{9}{20} \ =\ 0.45\\
\\
\\
\\
( d) \ \frac{1}{50} \ =\ 0.02
\end{array}$
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