Answer
$5.76\times10^{4}$
Work Step by Step
Using laws of exponents and concepts of scientific notation, then,
\begin{array}{l}
\dfrac{(0.00012)(144,000)}{0.0003}
\\\\=
\dfrac{(1.2\times10^{-4})(1.44\times10^{5})}{3.0\times10^{-4}}
\\\\=
(1.2\times1.44\div3.0)(10^{-4+5-(-4)})
\\\\=
(0.576)(10^{5})
\\\\=
5.76\times10^{4}
.\end{array}
