-50.1% is the change from 507 to 253
Calculation steps:
[( 253 - 507 ) ÷ 507] x 100 = -50.1%
Formula
Percentage change = [(253 - 507) / 507] x 100
Subtract the new number by the original number
253 - 507 = -254
-254 ÷ 507 = -0.5009861932938856
-0.5009861932938856 x 100 = -50.1%