-21.77% is the change from 620 to 485
Calculation steps:
[( 485 - 620 ) ÷ 620] x 100 = -21.77%
Formula
Percentage change = [(485 - 620) / 620] x 100
Subtract the new number by the original number
485 - 620 = -135
-135 ÷ 620 = -0.21774193548387097
-0.21774193548387097 x 100 = -21.77%