527.71% is the change from 83 to 521
Calculation steps:
[( 521 - 83 ) ÷ 83] x 100 = 527.71%
Formula
Percentage change = [(521 - 83) / 83] x 100
Subtract the new number by the original number
521 - 83 = 438
438 ÷ 83 = 5.27710843373494
5.27710843373494 x 100 = 527.71%