-13.6% is the change from 1000 to 864
Calculation steps:
[( 864 - 1000 ) ÷ 1000] x 100 = -13.6%
Formula
Percentage change = [(864 - 1000) / 1000] x 100
Subtract the new number by the original number
864 - 1000 = -136
-136 ÷ 1000 = -0.136
-0.136 x 100 = -13.6%