-86% is the change from 507 to 71
Calculation steps:
[( 71 - 507 ) ÷ 507] x 100 = -86%
Formula
Percentage change = [(71 - 507) / 507] x 100
Subtract the new number by the original number
71 - 507 = -436
-436 ÷ 507 = -0.8599605522682445
-0.8599605522682445 x 100 = -86%