-75.49% is the change from 510 to 125
Calculation steps:
[( 125 - 510 ) ÷ 510] x 100 = -75.49%
Formula
Percentage change = [(125 - 510) / 510] x 100
Subtract the new number by the original number
125 - 510 = -385
-385 ÷ 510 = -0.7549019607843137
-0.7549019607843137 x 100 = -75.49%