-50.69% is the change from 507 to 250
Calculation steps:
[( 250 - 507 ) ÷ 507] x 100 = -50.69%
Formula
Percentage change = [(250 - 507) / 507] x 100
Subtract the new number by the original number
250 - 507 = -257
-257 ÷ 507 = -0.5069033530571992
-0.5069033530571992 x 100 = -50.69%