-34.68% is the change from 620 to 405
Calculation steps:
[( 405 - 620 ) ÷ 620] x 100 = -34.68%
Formula
Percentage change = [(405 - 620) / 620] x 100
Subtract the new number by the original number
405 - 620 = -215
-215 ÷ 620 = -0.3467741935483871
-0.3467741935483871 x 100 = -34.68%