7^2 is 49, 4^2 is 16, all the other factors cancel. Yes, of course the right way to say it is "reduces the energy by 67%," but it's not that hard to see what wa

7^2 is 49, 4^2 is 16, all the other factors cancel. Yes, of course the right way to say it is "reduces the energy by 67%," but it's not that hard to see what was meant.