68.77% is the change from 397 to 670
Calculation steps:
[( 670 - 397 ) ÷ 397] x 100 = 68.77%
Formula
Percentage change = [(670 - 397) / 397] x 100
Subtract the new number by the original number
670 - 397 = 273
273 ÷ 397 = 0.6876574307304786
0.6876574307304786 x 100 = 68.77%