Problem
2000 AMC 8 Problem 25
The area of rectangle ABCD is 72. If point A and the midpoints of \overline{BC} and \overline{CD} are joined to form a triangle, the area of that triangle is
![[asy] pair A,B,C,D; A = (0,8); B = (9,8); C = (9,0); D = (0,0); draw(A--B--C--D--A--(9,4)--(4.5,0)--cycle); label("$A$",A,NW); label("$B$",B,NE); label("$C$",C,SE); label("$D$",D,SW); [/asy]](/static/aops/82d9c49065366cbfc4a0be7f8a732970a7640dca.png)
\text{(A)}\ 21 \qquad \text{(B)}\ 27 \qquad \text{(C)}\ 30 \qquad \text{(D)}\ 36 \qquad \text{(E)}\ 40
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