Simplify the following expression to simplest form using only positive exponents.

(32x^-15 y^30)^4/5

(32x^(-3) y^6)^4/5

= (2^5 x^(-3) y^6)^4/5
= 2^4 x^(-12/5) y^(24/5)
= 16x^(-12/5) y^(24/5)