The teacher's monthly income is $2750.
"A number that expresses parts of a whole object or a set of objects is called as a fraction. Parts of a fraction are a numerator, a denominator and a fraction bar."
According to the question
Rent paid by the teacher = $1100.
Amount of rent paid by a teacher is two-fifths of the teacher's monthly income.
Dividing rent paid by the teacher to two-fifths(fraction) of the teacher's monthly income gives us teacher's monthly income.
= [tex]\frac{1100}{\frac{2}{5} }[/tex]
= [tex]\frac{1100}{2}[/tex] × [tex]5[/tex]
= 550 × 5
= $2750
Hence, the teacher's monthly income is $2750.
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