-98.4% is the change from 625 to 10
Calculation steps:
[( 10 - 625 ) ÷ 625] x 100 = -98.4%
Formula
Percentage change = [(10 - 625) / 625] x 100
Subtract the new number by the original number
10 - 625 = -615
-615 ÷ 625 = -0.984
-0.984 x 100 = -98.4%
Example