19. The figure on the right is a square composed of Jia, Yi, Bing, and Ding, where Jia and Ding are squares with side lengths in whole centimeters, and Yi and Bing are rectangles. The sum of the areas of Jia and Ding is 100 square centimeters. Therefore, the sum of the areas of rectangles Yi and Bing is ( ) square centimeters.