Think twice next time someone asks you for "five minutes of your time" it could cost you more than you think. A British professor has (15)______ a mathematical (16) _____ to help people find out exactly how much an hour of their time is worth. Professor Ian Walker of Warwick University (17) _______the value of time after research showed that over 80 percent of respondents would buy more time if they could (18) ______ it. "Traditionally, wages or salaries have given an (19) _______ of how we are valued at work," Walker, an (20) ______ professor, said in a statement. "However, by looking at salaries against taxation, the cost of living and (21) _____ variations, we can see (22)____________________" The formula could help in making decisions, such as whether to cook a meal or to get a takeaway, or whether to take public transport or a taxi. Visitors to www. barclaycard, co. uk/timeismoney can (23)__________________by entering their salary, the region where they work and what kind of work they do. For example, for a professional working in London and earning 25,000 pounds a year, an hour would be worth 6.44 pounds, according to the Web site. Cooking dinner would cost 5.37 pounds－cheaper to get a takeaway, (24)__________Brushing your teeth comes at 32 pence－perhaps hard to find someone to do it for you for less.
【参考答案】
once you add the cost of the raw materials needed to make it......