Raul spent less than he'd anticipated spending. To learn how much less, subtract $87.50 from the $125 budget figure. This "difference" is negative.
Next, divide this "difference" by $125. The correct result will be a negative decimal fraction. You must multiply this result by 100% to convert it to a percentage, as required.
Confusing question but I would get 0, as if you have 4cm, that squared = 16cm^2. Therefore if it were increasing anymore, then you would not be able to get a value of 16.
