-87.83% is the change from 830 to 101
Calculation steps:
[( 101 - 830 ) ÷ 830] x 100 = -87.83%
Formula
Percentage change = [(101 - 830) / 830] x 100
Subtract the new number by the original number
101 - 830 = -729
-729 ÷ 830 = -0.8783132530120482
-0.8783132530120482 x 100 = -87.83%