-72.78% is the change from 507 to 138
Calculation steps:
[( 138 - 507 ) ÷ 507] x 100 = -72.78%
Formula
Percentage change = [(138 - 507) / 507] x 100
Subtract the new number by the original number
138 - 507 = -369
-369 ÷ 507 = -0.727810650887574
-0.727810650887574 x 100 = -72.78%