20.35% is the change from 678 to 816
Calculation steps:
[( 816 - 678 ) ÷ 678] x 100 = 20.35%
Formula
Percentage change = [(816 - 678) / 678] x 100
Subtract the new number by the original number
816 - 678 = 138
138 ÷ 678 = 0.20353982300884957
0.20353982300884957 x 100 = 20.35%