A gross a score plus a bakers dozen comes to what total?

Never heard of "bakers score" and "bakers gross", a bakers dozen is 13 because bakers used to throw in an extra bun for example if you ordered 12 buns, a baker would throw in one more making it thirteen, a score is 20 and a gross is 144, so if you go with the "bakers dozen" rule I suppose you add one to a score and one to a gross.