23.88% is the change from 670 to 830
Calculation steps:
[( 830 - 670 ) ÷ 670] x 100 = 23.88%
Formula
Percentage change = [(830 - 670) / 670] x 100
Subtract the new number by the original number
830 - 670 = 160
160 ÷ 670 = 0.23880597014925373
0.23880597014925373 x 100 = 23.88%