Total number of animals: \(110 \)
Number of rabbits: \(90 \)
Number of chickens: \(110-90=20\)
Fraction representation of chickens over the total number of animals: \(\frac{20}{110}\)
Percentage :\(\frac{20}{110}\times100=\frac{(20\times100)}{110}=2000/110=18.18 \)%