-32.81% is the change from 506 to 340
Calculation steps:
[( 340 - 506 ) ÷ 506] x 100 = -32.81%
Formula
Percentage change = [(340 - 506) / 506] x 100
Subtract the new number by the original number
340 - 506 = -166
-166 ÷ 506 = -0.32806324110671936
-0.32806324110671936 x 100 = -32.81%