-52.14% is the change from 840 to 402
Calculation steps:
[( 402 - 840 ) ÷ 840] x 100 = -52.14%
Formula
Percentage change = [(402 - 840) / 840] x 100
Subtract the new number by the original number
402 - 840 = -438
-438 ÷ 840 = -0.5214285714285715
-0.5214285714285715 x 100 = -52.14%