IKMC 2027 - Grades 7-8 - Self-study SET 1 - Thematic Batch 3 Question 13

Points $K,L,M,N$ are respectively the midpoints of $AD,AB,CB,DC$ of rectangle $ABCD$. Points $O,P,R,S$ are the midpoints of the sides of quadrilateral $KLMN$, as shown. What fraction of the area of rectangle $ABCD$ is shaded?