-89.4% is the change from 830 to 88
Calculation steps:
[( 88 - 830 ) ÷ 830] x 100 = -89.4%
Formula
Percentage change = [(88 - 830) / 830] x 100
Subtract the new number by the original number
88 - 830 = -742
-742 ÷ 830 = -0.8939759036144578
-0.8939759036144578 x 100 = -89.4%