-79.63% is the change from 486 to 99
Calculation steps:
[( 99 - 486 ) ÷ 486] x 100 = -79.63%
Formula
Percentage change = [(99 - 486) / 486] x 100
Subtract the new number by the original number
99 - 486 = -387
-387 ÷ 486 = -0.7962962962962963
-0.7962962962962963 x 100 = -79.63%