27.5% is the change from 200 to 255
Calculation steps:
[( 255 - 200 ) ÷ 200] x 100 = 27.5%
Formula
Percentage change = [(255 - 200) / 200] x 100
Subtract the new number by the original number
255 - 200 = 55
55 ÷ 200 = 0.275
0.275 x 100 = 27.5%
Example