22.35% is the change from 671 to 821
Calculation steps:
[( 821 - 671 ) ÷ 671] x 100 = 22.35%
Formula
Percentage change = [(821 - 671) / 671] x 100
Subtract the new number by the original number
821 - 671 = 150
150 ÷ 671 = 0.22354694485842028
0.22354694485842028 x 100 = 22.35%