The right answer is c. 2.22
A rational number is a number that can be expressed as the quotient of two integers, that is, the mathematical equation that model this statement is:
[tex]\frac{p}{q}[/tex]
where p and q are integers and q is non-zero. In the choices above, only 2.22 accomplishes with this condition because:
[tex]2.22=\frac{111}{100}[/tex]
Therefore:
[tex]2.22 \times 0.5=\frac{111}{50} \times 0.5 = \boxed{1.11=\frac{111}{100}}[/tex]
In conclusion, 1.11 is also a rational number
