-47.85% is the change from 815 to 425
Calculation steps:
[( 425 - 815 ) ÷ 815] x 100 = -47.85%
Formula
Percentage change = [(425 - 815) / 815] x 100
Subtract the new number by the original number
425 - 815 = -390
-390 ÷ 815 = -0.4785276073619632
-0.4785276073619632 x 100 = -47.85%