Relative percentage decrease change from 9 to 9?

Relative percentage decrease change from 9 to 11?

:: written in two ways ::

Rounded to 12 decimals ≈ - 11.111111111111%

Rounded to maximum 2 decimals ≈ - 11.11%

Absolute change (actual difference):

9 - 10 = - 1

Relative percentage decrease change from 9 to 9?

Relative percentage decrease change from 9 to 11?