-20.12% is the change from 507 to 405
Calculation steps:
[( 405 - 507 ) ÷ 507] x 100 = -20.12%
Formula
Percentage change = [(405 - 507) / 507] x 100
Subtract the new number by the original number
405 - 507 = -102
-102 ÷ 507 = -0.20118343195266272
-0.20118343195266272 x 100 = -20.12%