-32.26% is the change from 620 to 420
Calculation steps:
[( 420 - 620 ) ÷ 620] x 100 = -32.26%
Formula
Percentage change = [(420 - 620) / 620] x 100
Subtract the new number by the original number
420 - 620 = -200
-200 ÷ 620 = -0.3225806451612903
-0.3225806451612903 x 100 = -32.26%