-83.17% is the change from 517 to 87
Calculation steps:
[( 87 - 517 ) ÷ 517] x 100 = -83.17%
Formula
Percentage change = [(87 - 517) / 517] x 100
Subtract the new number by the original number
87 - 517 = -430
-430 ÷ 517 = -0.8317214700193424
-0.8317214700193424 x 100 = -83.17%