-49.75% is the change from 806 to 405
Calculation steps:
[( 405 - 806 ) ÷ 806] x 100 = -49.75%
Formula
Percentage change = [(405 - 806) / 806] x 100
Subtract the new number by the original number
405 - 806 = -401
-401 ÷ 806 = -0.4975186104218362
-0.4975186104218362 x 100 = -49.75%
Example