25.97% is the change from 647 to 815
Calculation steps:
[( 815 - 647 ) ÷ 647] x 100 = 25.97%
Formula
Percentage change = [(815 - 647) / 647] x 100
Subtract the new number by the original number
815 - 647 = 168
168 ÷ 647 = 0.2596599690880989
0.2596599690880989 x 100 = 25.97%