-92.47% is the change from 850 to 64
Calculation steps:
[( 64 - 850 ) ÷ 850] x 100 = -92.47%
Formula
Percentage change = [(64 - 850) / 850] x 100
Subtract the new number by the original number
64 - 850 = -786
-786 ÷ 850 = -0.9247058823529412
-0.9247058823529412 x 100 = -92.47%