-22.88% is the change from 507 to 391
Calculation steps:
[( 391 - 507 ) ÷ 507] x 100 = -22.88%
Formula
Percentage change = [(391 - 507) / 507] x 100
Subtract the new number by the original number
391 - 507 = -116
-116 ÷ 507 = -0.22879684418145957
-0.22879684418145957 x 100 = -22.88%