-75.74% is the change from 507 to 123
Calculation steps:
[( 123 - 507 ) ÷ 507] x 100 = -75.74%
Formula
Percentage change = [(123 - 507) / 507] x 100
Subtract the new number by the original number
123 - 507 = -384
-384 ÷ 507 = -0.757396449704142
-0.757396449704142 x 100 = -75.74%