31.34% is the change from 670 to 880
Calculation steps:
[( 880 - 670 ) ÷ 670] x 100 = 31.34%
Formula
Percentage change = [(880 - 670) / 670] x 100
Subtract the new number by the original number
880 - 670 = 210
210 ÷ 670 = 0.31343283582089554
0.31343283582089554 x 100 = 31.34%