20.28% is the change from 212 to 255
Calculation steps:
[( 255 - 212 ) ÷ 212] x 100 = 20.28%
Formula
Percentage change = [(255 - 212) / 212] x 100
Subtract the new number by the original number
255 - 212 = 43
43 ÷ 212 = 0.2028301886792453
0.2028301886792453 x 100 = 20.28%