-5.44% is the change from 900 to 851
Calculation steps:
[( 851 - 900 ) ÷ 900] x 100 = -5.44%
Formula
Percentage change = [(851 - 900) / 900] x 100
Subtract the new number by the original number
851 - 900 = -49
-49 ÷ 900 = -0.05444444444444444
-0.05444444444444444 x 100 = -5.44%