-57.38% is the change from 915 to 390
Calculation steps:
[( 390 - 915 ) ÷ 915] x 100 = -57.38%
Formula
Percentage change = [(390 - 915) / 915] x 100
Subtract the new number by the original number
390 - 915 = -525
-525 ÷ 915 = -0.5737704918032787
-0.5737704918032787 x 100 = -57.38%