242.97% is the change from 256 to 878
Calculation steps:
[( 878 - 256 ) ÷ 256] x 100 = 242.97%
Formula
Percentage change = [(878 - 256) / 256] x 100
Subtract the new number by the original number
878 - 256 = 622
622 ÷ 256 = 2.4296875
2.4296875 x 100 = 242.97%