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| 投稿者:ともっち - 投稿日時:2002年04月09日 09時45分34秒 |
数学は決して苦手な方ではないのですが、下記２問の解法のし方がどうしてもわかりません。分かる方は解き方を教えてください。
A merchant paid $300 for a shipment of x identical calculators. The merchant used 2 of the calculators as demonstrators and sold each of the other for 55 more than the average(arithmetic mean) cost of the x calculators. If the total revenue from the sale of the calculators was $120 more than the cost of the shipment, how many calculators were in the shipment?
A. 30
Mr. Filancia plans a profit of 10 precent on the selling price of an article. If his expenses excluding the cost of the article are 15 percent of sales. What should his rate of markup on the cost be?
A. 33.3333%
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