George likes breakfast tacos and milk. His utility is given by $u(t, m) = t + 5 \ln(m)$. Suppose tacos and milk both cost 1 dollar a piece. How should George spend the $\$4$ he has set aside for breakfast?
I know I need to use kuhn-tucker conditions, but I am confused how this process works with non-negativity constraints of $t ≥ 0$ and $m ≥ 0$.