21.19% is the change from 670 to 812
Calculation steps:
[( 812 - 670 ) ÷ 670] x 100 = 21.19%
Formula
Percentage change = [(812 - 670) / 670] x 100
Subtract the new number by the original number
812 - 670 = 142
142 ÷ 670 = 0.21194029850746268
0.21194029850746268 x 100 = 21.19%