 Okay, so I have to work out what happens when I double the point size of a word in terms of how much ink I need. Now obviously the amount of ink I need depends on the volume of ink, so it's the volume of ink that make up that letter. But when I double the point size, I'm not really changing the thickness of that letter as it's written on the page, or I assume so. And so really what matters is the area, so if I have an area, so if I'm writing a letter A, is it why I don't design fonts, that's a terrible A, but if I'm changing the length, which is the point size, then I'm also going to have to change the height. And so the area is going to change proportional to that length squared. So if I double the length, my area is going to be 2L all squared, which is going to be 4 times L squared. So if I double the length, I'm going to quadruple the area. So how much more ink? 4 times as much ink.