400% is the change from 83 to 415
Calculation steps:
[( 415 - 83 ) ÷ 83] x 100 = 400%
Formula
Percentage change = [(415 - 83) / 83] x 100
Subtract the new number by the original number
415 - 83 = 332
332 ÷ 83 = 4
4 x 100 = 400%
Example