Question 28
The line whose equation is $2x+y=100$ meets the $y$-axis at $A$. $B$ is the point on the $x$-axis such that $AB$ is perpendicular to the line and $C$ lies on $AB$ such that $OC$ is perpendicular to $AB$, where $O$ is the origin. $D$ is the foot of perpendicular from $C$ to the $x$-axis. Find the area of triangle $OCD$.