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The total income for Mr Johnson's apartment building is given by the following expression:
[tex]5r-2c-3p[/tex]where:
r: amount of rent paid by each tenant = $500
c: cost of the cable bill = $80
p: cost of the phone bill = $40
By replacing the previous values of the patameters in the expression for the total incomes you obtain:
[tex]5(500)-2(80)-3(40)=2500-160-120=2220[/tex]Hence the total income of Mr Johnsons's is $2220