-51.28% is the change from 507 to 247
Calculation steps:
[( 247 - 507 ) ÷ 507] x 100 = -51.28%
Formula
Percentage change = [(247 - 507) / 507] x 100
Subtract the new number by the original number
247 - 507 = -260
-260 ÷ 507 = -0.5128205128205128
-0.5128205128205128 x 100 = -51.28%