-27.97% is the change from 715 to 515
Calculation steps:
[( 515 - 715 ) ÷ 715] x 100 = -27.97%
Formula
Percentage change = [(515 - 715) / 715] x 100
Subtract the new number by the original number
515 - 715 = -200
-200 ÷ 715 = -0.27972027972027974
-0.27972027972027974 x 100 = -27.97%