810.91% is the change from 55 to 501
Calculation steps:
[( 501 - 55 ) ÷ 55] x 100 = 810.91%
Formula
Percentage change = [(501 - 55) / 55] x 100
Subtract the new number by the original number
501 - 55 = 446
446 ÷ 55 = 8.10909090909091
8.10909090909091 x 100 = 810.91%