-57.1% is the change from 909 to 390
Calculation steps:
[( 390 - 909 ) ÷ 909] x 100 = -57.1%
Formula
Percentage change = [(390 - 909) / 909] x 100
Subtract the new number by the original number
390 - 909 = -519
-519 ÷ 909 = -0.570957095709571
-0.570957095709571 x 100 = -57.1%