-50.06% is the change from 815 to 407
Calculation steps:
[( 407 - 815 ) ÷ 815] x 100 = -50.06%
Formula
Percentage change = [(407 - 815) / 815] x 100
Subtract the new number by the original number
407 - 815 = -408
-408 ÷ 815 = -0.5006134969325153
-0.5006134969325153 x 100 = -50.06%