-92% is the change from 850 to 68
Calculation steps:
[( 68 - 850 ) ÷ 850] x 100 = -92%
Formula
Percentage change = [(68 - 850) / 850] x 100
Subtract the new number by the original number
68 - 850 = -782
-782 ÷ 850 = -0.92
-0.92 x 100 = -92%
Example