Areal estate agency offers three apartments for rent in new mexico city. the expected total revenue per month from monthly rentals for the three apartments is $1,600. the individual owners of these apartments bear the monthly maintenance costs of 20% of the rent for the first two apartments and 25% of the rent for the third apartment, which is a total amount of $345. the agency charges a monthly fee equal to 10% of the rent for apartments 1 and 3 and a fee equal to 20% of the rent for apartment 2. the monthly rent plus agency fees totals $1,820. let x, y, and z represent the monthly rental for the first, second, and third apartments, respectively.