-71.53% is the change from 850 to 242
Calculation steps:
[( 242 - 850 ) ÷ 850] x 100 = -71.53%
Formula
Percentage change = [(242 - 850) / 850] x 100
Subtract the new number by the original number
242 - 850 = -608
-608 ÷ 850 = -0.7152941176470589
-0.7152941176470589 x 100 = -71.53%