155.39% is the change from 204 to 521
Calculation steps:
[( 521 - 204 ) ÷ 204] x 100 = 155.39%
Formula
Percentage change = [(521 - 204) / 204] x 100
Subtract the new number by the original number
521 - 204 = 317
317 ÷ 204 = 1.553921568627451
1.553921568627451 x 100 = 155.39%