Question Number 40060 by Rio Mike last updated on 15/Jul/18
$${Mr}\:{John}\:{bought}\:{a}\:{four}\:{roomed} \\ $$$${house}\:{for}\:\mathrm{2520000}{bucks}. \\ $$$${these}\:{rooms}\:{are}\:{rented}\:{out} \\ $$$${to}\:{four}\:{students}\:,{at}\:\mathrm{9000}\:{buck} \\ $$$${per}\:{month}\:{for}\:{each}\:{room}. \\ $$$$\left.{a}\right)\:{find}\:{the}\:{rents}\:{collected}\:{at}\:{the}\:{end} \\ $$$${of}\:{each}\:{year}.{if}\:{each}\:{year}\:\mathrm{72000}\:{bucks} \\ $$$${is}\:{spent}\:{on}\:{repairs}. \\ $$$$\left.{b}\right)\:{find}\:{the}\:{real}\:{annual}\:{income}\:{on}\:{the}\:{house} \\ $$$$ \\ $$