# Area of a triangle defined by the midpoint of a median

In triangle $$ABC$$ , $$M$$ is the midpoint of $$BC$$ and $$N$$ is the midpoint of $$AM$$. $$BN$$ when extended intersect $$AC$$ at $$D$$. If the area of triangle $$ABC$$ is $$20$$ square units , what is the area of triangle $$AND$$ ?

See picture for my attempt and diagram