-50.92% is the change from 819 to 402
Calculation steps:
[( 402 - 819 ) ÷ 819] x 100 = -50.92%
Formula
Percentage change = [(402 - 819) / 819] x 100
Subtract the new number by the original number
402 - 819 = -417
-417 ÷ 819 = -0.5091575091575091
-0.5091575091575091 x 100 = -50.92%