-23.77% is the change from 509 to 388
Calculation steps:
[( 388 - 509 ) ÷ 509] x 100 = -23.77%
Formula
Percentage change = [(388 - 509) / 509] x 100
Subtract the new number by the original number
388 - 509 = -121
-121 ÷ 509 = -0.23772102161100198
-0.23772102161100198 x 100 = -23.77%