-78% is the change from 850 to 187
Calculation steps:
[( 187 - 850 ) ÷ 850] x 100 = -78%
Formula
Percentage change = [(187 - 850) / 850] x 100
Subtract the new number by the original number
187 - 850 = -663
-663 ÷ 850 = -0.78
-0.78 x 100 = -78%
Example