-51.91% is the change from 836 to 402
Calculation steps:
[( 402 - 836 ) ÷ 836] x 100 = -51.91%
Formula
Percentage change = [(402 - 836) / 836] x 100
Subtract the new number by the original number
402 - 836 = -434
-434 ÷ 836 = -0.5191387559808612
-0.5191387559808612 x 100 = -51.91%