-98.22% is the change from 842 to 15
Calculation steps:
[( 15 - 842 ) ÷ 842] x 100 = -98.22%
Formula
Percentage change = [(15 - 842) / 842] x 100
Subtract the new number by the original number
15 - 842 = -827
-827 ÷ 842 = -0.982185273159145
-0.982185273159145 x 100 = -98.22%