We are all used to seeing "y is 150% *of* x", which means y = 1.5x. We are less used to seeing "y is 150% *more than* x" and there is a temptation to think they are the same. Wrong!

"y is 150% more than x" means that y = x plus 150% of x, which is y = x + 1.5x = 2.5x.

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