-91.66% is the change from 839 to 70
Calculation steps:
[( 70 - 839 ) ÷ 839] x 100 = -91.66%
Formula
Percentage change = [(70 - 839) / 839] x 100
Subtract the new number by the original number
70 - 839 = -769
-769 ÷ 839 = -0.9165673420738975
-0.9165673420738975 x 100 = -91.66%