-57.6% is the change from 915 to 388
Calculation steps:
[( 388 - 915 ) ÷ 915] x 100 = -57.6%
Formula
Percentage change = [(388 - 915) / 915] x 100
Subtract the new number by the original number
388 - 915 = -527
-527 ÷ 915 = -0.5759562841530055
-0.5759562841530055 x 100 = -57.6%