-15.71% is the change from 503 to 424
Calculation steps:
[( 424 - 503 ) ÷ 503] x 100 = -15.71%
Formula
Percentage change = [(424 - 503) / 503] x 100
Subtract the new number by the original number
424 - 503 = -79
-79 ÷ 503 = -0.15705765407554673
-0.15705765407554673 x 100 = -15.71%