-85.05% is the change from 515 to 77
Calculation steps:
[( 77 - 515 ) ÷ 515] x 100 = -85.05%
Formula
Percentage change = [(77 - 515) / 515] x 100
Subtract the new number by the original number
77 - 515 = -438
-438 ÷ 515 = -0.8504854368932039
-0.8504854368932039 x 100 = -85.05%