In this diagram, not drawn to scale, figures I and III are equilateral triangular regions with respective areas of 323 and 83 square inches. Figure II is a square region with area 32 sq. in. Let the length of segment AD be decreased by 1221% of itself, while the lengths of AB and CD remain unchanged. The percent decrease in the area of the square is:
[asy]
draw((0,0)--(22.6,0));
draw((0,0)--(5.66,9.8)--(11.3,0)--(11.3,5.66)--(16.96,5.66)--(16.96,0)--(19.45,4.9)--(22.6,0));
label("A", (0,0), S);
label("B", (11.3,0), S);
label("C", (16.96,0), S);
label("D", (22.6,0), S);
label("I", (5.66, 3.9));
label("II", (14.15,2.83));
label("III", (19.7,2));
[/asy]
<spanclass=′latex−bold′>(A)</span> 1221<spanclass=′latex−bold′>(B)</span> 25<spanclass=′latex−bold′>(C)</span> 50<spanclass=′latex−bold′>(D)</span> 75<spanclass=′latex−bold′>(E)</span> 8721 geometrypercentpercent decreaseAMC