410% is the change from 50 to 255
Calculation steps:
[( 255 - 50 ) ÷ 50] x 100 = 410%
Formula
Percentage change = [(255 - 50) / 50] x 100
Subtract the new number by the original number
255 - 50 = 205
205 ÷ 50 = 4.1
4.1 x 100 = 410%
Example