The given product is
[tex](6.3\times10^{-2})(9.9\times10^{-3})[/tex]
To solve this multiplication, we multiply the coefficients between each other, and the power between each other.
[tex](6.3\cdot9.9)(10^{-2}\cdot10^{-3})=62.37\times10^{-2-3}=62.37\times10^{-5}[/tex]
Which is approximated to
[tex]60\times10^{-5}[/tex]
Therefore, the right answer is B.
