Three point charges are arranged in a right triangle: $$q_1 = 2.0\ \mu \mathrm{C}$$ at the origin (0, 0), $$q_2 = -3.0\ \mu \mathrm{C}$$ at (3.0\ \mathrm{m}, 0), and $$q_3 = 4.0\ \mu \mathrm{C}$$ at (0, 4.0\ \mathrm{m})$. What is the total electric potential energy of this system? Use $$k = 8.99 \times 10^9\ \mathrm{N \cdot m^2/C^2}$$.