-23.76% is the change from 850 to 648
Calculation steps:
[( 648 - 850 ) ÷ 850] x 100 = -23.76%
Formula
Percentage change = [(648 - 850) / 850] x 100
Subtract the new number by the original number
648 - 850 = -202
-202 ÷ 850 = -0.2376470588235294
-0.2376470588235294 x 100 = -23.76%