-74.56% is the change from 507 to 129
Calculation steps:
[( 129 - 507 ) ÷ 507] x 100 = -74.56%
Formula
Percentage change = [(129 - 507) / 507] x 100
Subtract the new number by the original number
129 - 507 = -378
-378 ÷ 507 = -0.7455621301775148
-0.7455621301775148 x 100 = -74.56%