-63.29% is the change from 850 to 312
Calculation steps:
[( 312 - 850 ) ÷ 850] x 100 = -63.29%
Formula
Percentage change = [(312 - 850) / 850] x 100
Subtract the new number by the original number
312 - 850 = -538
-538 ÷ 850 = -0.6329411764705882
-0.6329411764705882 x 100 = -63.29%