26.75% is the change from 643 to 815
Calculation steps:
[( 815 - 643 ) ÷ 643] x 100 = 26.75%
Formula
Percentage change = [(815 - 643) / 643] x 100
Subtract the new number by the original number
815 - 643 = 172
172 ÷ 643 = 0.26749611197511663
0.26749611197511663 x 100 = 26.75%