138.57% is the change from 280 to 668
Calculation steps:
[( 668 - 280 ) ÷ 280] x 100 = 138.57%
Formula
Percentage change = [(668 - 280) / 280] x 100
Subtract the new number by the original number
668 - 280 = 388
388 ÷ 280 = 1.3857142857142857
1.3857142857142857 x 100 = 138.57%