512.94% is the change from 85 to 521
Calculation steps:
[( 521 - 85 ) ÷ 85] x 100 = 512.94%
Formula
Percentage change = [(521 - 85) / 85] x 100
Subtract the new number by the original number
521 - 85 = 436
436 ÷ 85 = 5.129411764705883
5.129411764705883 x 100 = 512.94%