217.25% is the change from 255 to 809
Calculation steps:
[( 809 - 255 ) ÷ 255] x 100 = 217.25%
Formula
Percentage change = [(809 - 255) / 255] x 100
Subtract the new number by the original number
809 - 255 = 554
554 ÷ 255 = 2.172549019607843
2.172549019607843 x 100 = 217.25%