-39.33% is the change from 506 to 307
Calculation steps:
[( 307 - 506 ) ÷ 506] x 100 = -39.33%
Formula
Percentage change = [(307 - 506) / 506] x 100
Subtract the new number by the original number
307 - 506 = -199
-199 ÷ 506 = -0.3932806324110672
-0.3932806324110672 x 100 = -39.33%