Before revision: In the construction industry, the 1:5:200 rule (or 1:5:200 ratio) is a rule of thumb that states that the initial construction costs of a building , the operating costs over 5 years , and the business staffing costs over 20 years could be expressed by the ratio 1:5:200.
After revision: In the construction industryis 1, then its maintenance and 1:5:200 rule (or 1:5:200 ratio) is a rule of thumb that states that the initial construction costs of a building , the operating costs over the years if 5 , and the business if