840% is the change from 55 to 517
Calculation steps:
[( 517 - 55 ) ÷ 55] x 100 = 840%
Formula
Percentage change = [(517 - 55) / 55] x 100
Subtract the new number by the original number
517 - 55 = 462
462 ÷ 55 = 8.4
8.4 x 100 = 840%
Example