31.19% is the change from 670 to 879
Calculation steps:
[( 879 - 670 ) ÷ 670] x 100 = 31.19%
Formula
Percentage change = [(879 - 670) / 670] x 100
Subtract the new number by the original number
879 - 670 = 209
209 ÷ 670 = 0.3119402985074627
0.3119402985074627 x 100 = 31.19%