-87.42% is the change from 620 to 78
Calculation steps:
[( 78 - 620 ) ÷ 620] x 100 = -87.42%
Formula
Percentage change = [(78 - 620) / 620] x 100
Subtract the new number by the original number
78 - 620 = -542
-542 ÷ 620 = -0.8741935483870967
-0.8741935483870967 x 100 = -87.42%