-75.5% is the change from 502 to 123
Calculation steps:
[( 123 - 502 ) ÷ 502] x 100 = -75.5%
Formula
Percentage change = [(123 - 502) / 502] x 100
Subtract the new number by the original number
123 - 502 = -379
-379 ÷ 502 = -0.7549800796812749
-0.7549800796812749 x 100 = -75.5%