筆試Numerical一題求解

關(guān)于production of 15mm buttons,July-December 的最后一問：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！！

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