$PQRS$ is a rectangle.
The coordinates of $P$ and $Q$ are $( 0,6 )$ and $( 1,8 )$ respectively.
The perpendicular to $PQ$ at $Q$ meets the $x$-axis at $R$.
What is the area of $PQRS$ ?
A $\frac { 5 } { 2 }$
B $4 \sqrt { 10 }$
C 20
D $8 \sqrt { 10 }$
E 40