-70% is the change from 290 to 87
Calculation steps:
[( 87 - 290 ) ÷ 290] x 100 = -70%
Formula
Percentage change = [(87 - 290) / 290] x 100
Subtract the new number by the original number
87 - 290 = -203
-203 ÷ 290 = -0.7
-0.7 x 100 = -70%
Example