21.94% is the change from 670 to 817
Calculation steps:
[( 817 - 670 ) ÷ 670] x 100 = 21.94%
Formula
Percentage change = [(817 - 670) / 670] x 100
Subtract the new number by the original number
817 - 670 = 147
147 ÷ 670 = 0.21940298507462686
0.21940298507462686 x 100 = 21.94%