【简答题】You may go to karaoke or disco clubs with your friends during the summer holidays. But be careful. In these 41 places you may see people selling small, colourful pills. Make sure you do not try them. ...
【单选题】Two years ago the price index appropriate to the cost of material X had a value of 120. It now has a value of 160. If material X costs $2,000 per kg today, what would its cost per kg have been two yea...
【单选题】Four years ago material X cost $5 per kg and the price index most appropriate to the cost of material X stood at 150. The same index now stands at 400. What is the best estimate of the current cost of...