27.99% is the change from 643 to 823
Calculation steps:
[( 823 - 643 ) ÷ 643] x 100 = 27.99%
Formula
Percentage change = [(823 - 643) / 643] x 100
Subtract the new number by the original number
823 - 643 = 180
180 ÷ 643 = 0.27993779160186627
0.27993779160186627 x 100 = 27.99%