70.84% is the change from 391 to 668
Calculation steps:
[( 668 - 391 ) ÷ 391] x 100 = 70.84%
Formula
Percentage change = [(668 - 391) / 391] x 100
Subtract the new number by the original number
668 - 391 = 277
277 ÷ 391 = 0.7084398976982097
0.7084398976982097 x 100 = 70.84%