-23.08% is the change from 507 to 390
Calculation steps:
[( 390 - 507 ) ÷ 507] x 100 = -23.08%
Formula
Percentage change = [(390 - 507) / 507] x 100
Subtract the new number by the original number
390 - 507 = -117
-117 ÷ 507 = -0.23076923076923078
-0.23076923076923078 x 100 = -23.08%