-12.9% is the change from 620 to 540
Calculation steps:
[( 540 - 620 ) ÷ 620] x 100 = -12.9%
Formula
Percentage change = [(540 - 620) / 620] x 100
Subtract the new number by the original number
540 - 620 = -80
-80 ÷ 620 = -0.12903225806451613
-0.12903225806451613 x 100 = -12.9%