-19.57% is the change from 506 to 407
Calculation steps:
[( 407 - 506 ) ÷ 506] x 100 = -19.57%
Formula
Percentage change = [(407 - 506) / 506] x 100
Subtract the new number by the original number
407 - 506 = -99
-99 ÷ 506 = -0.1956521739130435
-0.1956521739130435 x 100 = -19.57%