-20.05% is the change from 394 to 315
Calculation steps:
[( 315 - 394 ) ÷ 394] x 100 = -20.05%
Formula
Percentage change = [(315 - 394) / 394] x 100
Subtract the new number by the original number
315 - 394 = -79
-79 ÷ 394 = -0.20050761421319796
-0.20050761421319796 x 100 = -20.05%