-27.8% is the change from 428 to 309
Calculation steps:
[( 309 - 428 ) ÷ 428] x 100 = -27.8%
Formula
Percentage change = [(309 - 428) / 428] x 100
Subtract the new number by the original number
309 - 428 = -119
-119 ÷ 428 = -0.2780373831775701
-0.2780373831775701 x 100 = -27.8%