-19.72% is the change from 507 to 407
Calculation steps:
[( 407 - 507 ) ÷ 507] x 100 = -19.72%
Formula
Percentage change = [(407 - 507) / 507] x 100
Subtract the new number by the original number
407 - 507 = -100
-100 ÷ 507 = -0.19723865877712032
-0.19723865877712032 x 100 = -19.72%