AMC 8 1992 Problem 21

Northside's Drum and Bugle Corps raised money for a trip. The drummers and bugle players kept separate sales records. According to the double bar graph, in what month did one group's sales exceed the other's by the greatest percent?

$\text{(A)}\ \text{Jan} \text{(B)}\ \text{Feb} \text{(C)}\ \text{Mar} \text{(D)}\ \text{Apr} \text{(E)}\ \text{May}$