-37.78% is the change from 675 to 420
Calculation steps:
[( 420 - 675 ) ÷ 675] x 100 = -37.78%
Formula
Percentage change = [(420 - 675) / 675] x 100
Subtract the new number by the original number
420 - 675 = -255
-255 ÷ 675 = -0.37777777777777777
-0.37777777777777777 x 100 = -37.78%