8.66% is the change from 670 to 728
Calculation steps:
[( 728 - 670 ) ÷ 670] x 100 = 8.66%
Formula
Percentage change = [(728 - 670) / 670] x 100
Subtract the new number by the original number
728 - 670 = 58
58 ÷ 670 = 0.08656716417910448
0.08656716417910448 x 100 = 8.66%