-19.76% is the change from 506 to 406
Calculation steps:
[( 406 - 506 ) ÷ 506] x 100 = -19.76%
Formula
Percentage change = [(406 - 506) / 506] x 100
Subtract the new number by the original number
406 - 506 = -100
-100 ÷ 506 = -0.1976284584980237
-0.1976284584980237 x 100 = -19.76%