2450% is the change from 10 to 255
Calculation steps:
[( 255 - 10 ) ÷ 10] x 100 = 2450%
Formula
Percentage change = [(255 - 10) / 10] x 100
Subtract the new number by the original number
255 - 10 = 245
245 ÷ 10 = 24.5
24.5 x 100 = 2450%
Example