Answer
$\frac{81}{625}$m$^{16}$n$^{20}$
Work Step by Step
($\frac{3}{5}$m$^4$n$^5$)$^4$
($\frac{3}{5}$)$^4$m$^{(4\times4)}$n$^{(5\times4)}$
$\frac{3^4}{5^4}$m$^{16}$n$^{20}$
$\frac{3^4}{5^4}$m$^{16}$n$^{20}$
$\frac{81}{625}$m$^{16}$n$^{20}$
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