161.18% is the change from 255 to 666
Calculation steps:
[( 666 - 255 ) ÷ 255] x 100 = 161.18%
Formula
Percentage change = [(666 - 255) / 255] x 100
Subtract the new number by the original number
666 - 255 = 411
411 ÷ 255 = 1.611764705882353
1.611764705882353 x 100 = 161.18%