-36.35% is the change from 509 to 324
Calculation steps:
[( 324 - 509 ) ÷ 509] x 100 = -36.35%
Formula
Percentage change = [(324 - 509) / 509] x 100
Subtract the new number by the original number
324 - 509 = -185
-185 ÷ 509 = -0.36345776031434185
-0.36345776031434185 x 100 = -36.35%