-50.76% is the change from 853 to 420
Calculation steps:
[( 420 - 853 ) ÷ 853] x 100 = -50.76%
Formula
Percentage change = [(420 - 853) / 853] x 100
Subtract the new number by the original number
420 - 853 = -433
-433 ÷ 853 = -0.5076201641266119
-0.5076201641266119 x 100 = -50.76%