-77.24% is the change from 290 to 66
Calculation steps:
[( 66 - 290 ) ÷ 290] x 100 = -77.24%
Formula
Percentage change = [(66 - 290) / 290] x 100
Subtract the new number by the original number
66 - 290 = -224
-224 ÷ 290 = -0.7724137931034483
-0.7724137931034483 x 100 = -77.24%