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筆試Numerical一題求解

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關於production of 15mm buttons,July-December 的'最後一問:What was the loss in potential sales revenue attributable to the production of sub-standard (as opposed to standard) buttons over the 6 month period? 答案137.50是如何求得的。麻煩幫我解答下 謝謝謝謝!!

筆試Numerical一題求解