Donnie and Dylan were both working on simplifying the expression at right. The first step of each of their work is shown below.

$( \frac { 2 x ^ { 5 } y ^ { 4 } } { 8 x y ^ { 3 } } ) ^ { 3 }$

Donnie:     ^{$\frac { 8 x ^ { 15 } y ^ { 12 } } { 512 x ^ { 3 } y ^ { 9 } }$}

Dylan:     ^{$( \frac { x ^ { 4 } y } { 4 } ) ^ { 3 }$}