-12.36% is the change from 89 to 78
Calculation steps:
[( 78 - 89 ) ÷ 89] x 100 = -12.36%
Formula
Percentage change = [(78 - 89) / 89] x 100
Subtract the new number by the original number
78 - 89 = -11
-11 ÷ 89 = -0.12359550561797752
-0.12359550561797752 x 100 = -12.36%