-54.84% is the change from 620 to 280
Calculation steps:
[( 280 - 620 ) ÷ 620] x 100 = -54.84%
Formula
Percentage change = [(280 - 620) / 620] x 100
Subtract the new number by the original number
280 - 620 = -340
-340 ÷ 620 = -0.5483870967741935
-0.5483870967741935 x 100 = -54.84%