22.54% is the change from 670 to 821
Calculation steps:
[( 821 - 670 ) ÷ 670] x 100 = 22.54%
Formula
Percentage change = [(821 - 670) / 670] x 100
Subtract the new number by the original number
821 - 670 = 151
151 ÷ 670 = 0.2253731343283582
0.2253731343283582 x 100 = 22.54%