150.98% is the change from 255 to 640
Calculation steps:
[( 640 - 255 ) ÷ 255] x 100 = 150.98%
Formula
Percentage change = [(640 - 255) / 255] x 100
Subtract the new number by the original number
640 - 255 = 385
385 ÷ 255 = 1.5098039215686274
1.5098039215686274 x 100 = 150.98%