Quinn tried to evaluate an expression step by step.
$\qquad\begin{align}
&(3 \cdot 10^4) \cdot 0.002 \\\\
\\
=&(3 \cdot 10^4) \cdot (2\cdot10^{-3})&\green{\text{Step } 1}\\\\
\\
=&(3\cdot2)\cdot(10^4\cdot10^{-3})&\blue{\text{Step } 2}\\\\
\\
=&6 \cdot10^1&\purple{\text{Step } 3} \\\\
\end{align}$
**Find Quinn's mistake.**
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