-36% is the change from 850 to 544
Calculation steps:
[( 544 - 850 ) ÷ 850] x 100 = -36%
Formula
Percentage change = [(544 - 850) / 850] x 100
Subtract the new number by the original number
544 - 850 = -306
-306 ÷ 850 = -0.36
-0.36 x 100 = -36%
Example