-32.94% is the change from 507 to 340
Calculation steps:
[( 340 - 507 ) ÷ 507] x 100 = -32.94%
Formula
Percentage change = [(340 - 507) / 507] x 100
Subtract the new number by the original number
340 - 507 = -167
-167 ÷ 507 = -0.32938856015779094
-0.32938856015779094 x 100 = -32.94%