-16.94% is the change from 620 to 515
Calculation steps:
[( 515 - 620 ) ÷ 620] x 100 = -16.94%
Formula
Percentage change = [(515 - 620) / 620] x 100
Subtract the new number by the original number
515 - 620 = -105
-105 ÷ 620 = -0.1693548387096774
-0.1693548387096774 x 100 = -16.94%