-52.1% is the change from 835 to 400
Calculation steps:
[( 400 - 835 ) ÷ 835] x 100 = -52.1%
Formula
Percentage change = [(400 - 835) / 835] x 100
Subtract the new number by the original number
400 - 835 = -435
-435 ÷ 835 = -0.5209580838323353
-0.5209580838323353 x 100 = -52.1%