-75.86% is the change from 290 to 70
Calculation steps:
[( 70 - 290 ) ÷ 290] x 100 = -75.86%
Formula
Percentage change = [(70 - 290) / 290] x 100
Subtract the new number by the original number
70 - 290 = -220
-220 ÷ 290 = -0.7586206896551724
-0.7586206896551724 x 100 = -75.86%