-78% is the change from 409 to 90
Calculation steps:
[( 90 - 409 ) ÷ 409] x 100 = -78%
Formula
Percentage change = [(90 - 409) / 409] x 100
Subtract the new number by the original number
90 - 409 = -319
-319 ÷ 409 = -0.7799511002444988
-0.7799511002444988 x 100 = -78%