-98.21% is the change from 838 to 15
Calculation steps:
[( 15 - 838 ) ÷ 838] x 100 = -98.21%
Formula
Percentage change = [(15 - 838) / 838] x 100
Subtract the new number by the original number
15 - 838 = -823
-823 ÷ 838 = -0.9821002386634845
-0.9821002386634845 x 100 = -98.21%