-20.57% is the change from 389 to 309
Calculation steps:
[( 309 - 389 ) ÷ 389] x 100 = -20.57%
Formula
Percentage change = [(309 - 389) / 389] x 100
Subtract the new number by the original number
309 - 389 = -80
-80 ÷ 389 = -0.20565552699228792
-0.20565552699228792 x 100 = -20.57%