-58.34% is the change from 821 to 342
Calculation steps:
[( 342 - 821 ) ÷ 821] x 100 = -58.34%
Formula
Percentage change = [(342 - 821) / 821] x 100
Subtract the new number by the original number
342 - 821 = -479
-479 ÷ 821 = -0.5834348355663824
-0.5834348355663824 x 100 = -58.34%