A triangle PQR is right angled at Q. E and F are mid points of QR and PR, respectively. What will be the ratio of the area of the quadrilateral PQEF to the area of triangle PQR.

$\frac{2}{3}$ $\frac{3}{4}$ $\frac{3}{2}$ $\frac{4}{3}$

$\frac{3}{4}$