-9.11% is the change from 900 to 818
Calculation steps:
[( 818 - 900 ) ÷ 900] x 100 = -9.11%
Formula
Percentage change = [(818 - 900) / 900] x 100
Subtract the new number by the original number
818 - 900 = -82
-82 ÷ 900 = -0.09111111111111111
-0.09111111111111111 x 100 = -9.11%