Final answer:
The total income for Mr. Johnson's apartment building can be found by substituting provided values into the equation (5r - 20 - 3p). Substituting the given values, we find that the total income is $2,360.
Step-by-step explanation:
The total income for Mr. Johnson's apartment building can be represented by the equation (5r - 20 - 3p), where r is the amount of rent paid by each tenant, c is the cost of the cable bill, and p is the cost of the phone bill. Given that the rent is $500, the cable bill is $80, and the phone bill is $40, we can substitute these values into the equation to find the total income for Mr. Johnson.
Substituting the values, we have: (5*500 - 20 - 3*40). Simplifying this expression, we get: (2500 - 20 - 120). Finally, performing the arithmetic, we have: 2360.
Therefore, the total income for Mr. Johnson is $2,360.