551.25% is the change from 80 to 521
Calculation steps:
[( 521 - 80 ) ÷ 80] x 100 = 551.25%
Formula
Percentage change = [(521 - 80) / 80] x 100
Subtract the new number by the original number
521 - 80 = 441
441 ÷ 80 = 5.5125
5.5125 x 100 = 551.25%
Example