27.15% is the change from 641 to 815
Calculation steps:
[( 815 - 641 ) ÷ 641] x 100 = 27.15%
Formula
Percentage change = [(815 - 641) / 641] x 100
Subtract the new number by the original number
815 - 641 = 174
174 ÷ 641 = 0.2714508580343214
0.2714508580343214 x 100 = 27.15%