-21.88% is the change from 393 to 307
Calculation steps:
[( 307 - 393 ) ÷ 393] x 100 = -21.88%
Formula
Percentage change = [(307 - 393) / 393] x 100
Subtract the new number by the original number
307 - 393 = -86
-86 ÷ 393 = -0.21882951653944022
-0.21882951653944022 x 100 = -21.88%