Two negative charges at a right angle

In vacuum the charge $q_0=+1.0\mu \mathrm{C}$ is at the origin, and two equal charges $q=-2.0\mu \mathrm{C}$ are at the points $(0.20\mathrm{m};0)$ and $(0;0.20\mathrm{m})$. Compute the magnitude and direction of the total force on $q_0$.