-59.53% is the change from 850 to 344
Calculation steps:
[( 344 - 850 ) ÷ 850] x 100 = -59.53%
Formula
Percentage change = [(344 - 850) / 850] x 100
Subtract the new number by the original number
344 - 850 = -506
-506 ÷ 850 = -0.5952941176470589
-0.5952941176470589 x 100 = -59.53%