-87.5% is the change from 624 to 78
Calculation steps:
[( 78 - 624 ) ÷ 624] x 100 = -87.5%
Formula
Percentage change = [(78 - 624) / 624] x 100
Subtract the new number by the original number
78 - 624 = -546
-546 ÷ 624 = -0.875
-0.875 x 100 = -87.5%
Example