Damn. I forgot that the skeleton was 15%, not 20%. xD Pfft. I'm an idiot sometimes.
Bors, while the alegbra looks right, considering the equation is put in percentages, I think it's more around 120 than 1200 in the game. xD All the same, it's the basic idea. Though, from your math, that's right. o.o So... Meh. =P