-85.03% is the change from 521 to 78
Calculation steps:
[( 78 - 521 ) ÷ 521] x 100 = -85.03%
Formula
Percentage change = [(78 - 521) / 521] x 100
Subtract the new number by the original number
78 - 521 = -443
-443 ÷ 521 = -0.8502879078694817
-0.8502879078694817 x 100 = -85.03%