-87.47% is the change from 790 to 99
Calculation steps:
[( 99 - 790 ) ÷ 790] x 100 = -87.47%
Formula
Percentage change = [(99 - 790) / 790] x 100
Subtract the new number by the original number
99 - 790 = -691
-691 ÷ 790 = -0.8746835443037975
-0.8746835443037975 x 100 = -87.47%