Before revision: In the construction industry, the 1:5:200 rule (or 1:5:200 ratio) is a rule of thumb that states that: "If the initial construction costs of a building is 1, then its maintenance and operating costs over the years is 5, and the business operating costs (salary of people working in that building) is 200."
After revision: In the construction industry, the 1:5:200 rule (or 1:5:200 ratio) is a rule of thumb that states that: