-50.55% is the change from 813 to 402
Calculation steps:
[( 402 - 813 ) ÷ 813] x 100 = -50.55%
Formula
Percentage change = [(402 - 813) / 813] x 100
Subtract the new number by the original number
402 - 813 = -411
-411 ÷ 813 = -0.5055350553505535
-0.5055350553505535 x 100 = -50.55%