20.85% is the change from 211 to 255
Calculation steps:
[( 255 - 211 ) ÷ 211] x 100 = 20.85%
Formula
Percentage change = [(255 - 211) / 211] x 100
Subtract the new number by the original number
255 - 211 = 44
44 ÷ 211 = 0.20853080568720378
0.20853080568720378 x 100 = 20.85%