A 150% increase from 100 would be 250. This is how you do increases with percentages: 50% increase in a 100 base: 100X 50% 100X.50 = 50 50+ 100 = 150. 100X150% 100X1.50= 150 150 + 100 = 250 If you don't understand PLEASE stop making yourself look like an idiot and google how to add percentages. Child. If you are not a child, you should most definitely understand because of interest rates. If you owe a 100 dollars but have a 5% interest rate, does that mean that you'll actually less than what you borrowed? Hell no. It's more. Because you say 100 X .05 and then add it