-38.24% is the change from 680 to 420
Calculation steps:
[( 420 - 680 ) ÷ 680] x 100 = -38.24%
Formula
Percentage change = [(420 - 680) / 680] x 100
Subtract the new number by the original number
420 - 680 = -260
-260 ÷ 680 = -0.38235294117647056
-0.38235294117647056 x 100 = -38.24%