23.58% is the change from 670 to 828
Calculation steps:
[( 828 - 670 ) ÷ 670] x 100 = 23.58%
Formula
Percentage change = [(828 - 670) / 670] x 100
Subtract the new number by the original number
828 - 670 = 158
158 ÷ 670 = 0.23582089552238805
0.23582089552238805 x 100 = 23.58%