30.24% is the change from 668 to 870
Calculation steps:
[( 870 - 668 ) ÷ 668] x 100 = 30.24%
Formula
Percentage change = [(870 - 668) / 668] x 100
Subtract the new number by the original number
870 - 668 = 202
202 ÷ 668 = 0.3023952095808383
0.3023952095808383 x 100 = 30.24%