【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...
【单选题】Six years ago material M cost $10 per kg and the price index most appropriate to the cost of material M was 130. The same index now stands at 510. What is the best estimate of the current cost of mate...
【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 430. What is the best estimate of the current cost of...