-75.45% is the change from 501 to 123
Calculation steps:
[( 123 - 501 ) ÷ 501] x 100 = -75.45%
Formula
Percentage change = [(123 - 501) / 501] x 100
Subtract the new number by the original number
123 - 501 = -378
-378 ÷ 501 = -0.7544910179640718
-0.7544910179640718 x 100 = -75.45%