-50.89% is the change from 507 to 249
Calculation steps:
[( 249 - 507 ) ÷ 507] x 100 = -50.89%
Formula
Percentage change = [(249 - 507) / 507] x 100
Subtract the new number by the original number
249 - 507 = -258
-258 ÷ 507 = -0.5088757396449705
-0.5088757396449705 x 100 = -50.89%