-20.29% is the change from 680 to 542
Calculation steps:
[( 542 - 680 ) ÷ 680] x 100 = -20.29%
Formula
Percentage change = [(542 - 680) / 680] x 100
Subtract the new number by the original number
542 - 680 = -138
-138 ÷ 680 = -0.20294117647058824
-0.20294117647058824 x 100 = -20.29%