214.9% is the change from 255 to 803
Calculation steps:
[( 803 - 255 ) ÷ 255] x 100 = 214.9%
Formula
Percentage change = [(803 - 255) / 255] x 100
Subtract the new number by the original number
803 - 255 = 548
548 ÷ 255 = 2.149019607843137
2.149019607843137 x 100 = 214.9%