400% is the change from 99 to 495
Calculation steps:
[( 495 - 99 ) ÷ 99] x 100 = 400%
Formula
Percentage change = [(495 - 99) / 99] x 100
Subtract the new number by the original number
495 - 99 = 396
396 ÷ 99 = 4
4 x 100 = 400%
Example