218.75% is the change from 256 to 816
Calculation steps:
[( 816 - 256 ) ÷ 256] x 100 = 218.75%
Formula
Percentage change = [(816 - 256) / 256] x 100
Subtract the new number by the original number
816 - 256 = 560
560 ÷ 256 = 2.1875
2.1875 x 100 = 218.75%