-90.1% is the change from 101 to 10
Calculation steps:
[( 10 - 101 ) ÷ 101] x 100 = -90.1%
Formula
Percentage change = [(10 - 101) / 101] x 100
Subtract the new number by the original number
10 - 101 = -91
-91 ÷ 101 = -0.900990099009901
-0.900990099009901 x 100 = -90.1%