英语翻译1.Find the cost and selling price if a pen is marked up

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英语翻译
1.Find the cost and selling price if a pen is marked up $500 with a 20% mark up rate based on selling price.
2.Find the mark-up and cost of a desk that sells for $29.90 and is marked up 25% of the selling price.
3.Find the selling price and mark up for a hotel room that costs a travel agent $280 and is marked up 30% of the selling price.
4.The cost price of a diamond is $4000,what is the retail price and mark up if the seller wants a 30% based on retail price?
5.A bakery prepared 80 kg of cake at the cost of $20 per kg,5% spoilage is expected.If it plans to make a 35% mark up...

1.如果一支笔在原价的基础上以20%的涨价幅度涨价了500元,那么求这支笔的现价和原价.
设笔原价x元,可得20%x=500,算出来就行了
2.一张桌子在原价29.90元基础上涨价25%,求现价及涨价多少?
涨价了29.9*25%,现价就是原价+涨的价
3.一间客房涨价30%使一个旅行代理人花了280元,求原价和涨价多少?
设原价为x元,130%x=280,算出原价,涨的价=280-原价
4.一颗钻石成本价是4000元,如果卖家想赚零售价的30%,那么零售价和涨的价钱是多少?
设零售价为x元,（100%-30%）x=4000,算出零售价,涨的价=零售价-成本价
5.一个面包店准备了80千克的糕点,每千克成本20元,预计将有5%的损坏.如果它计划涨价35%.（后面怎么没输入上去啊）
成本是80*20=1600元,损坏5%后糕点只剩76千克,涨价35%后每千克27元,卖完可得76*27=2052元,我估计是想问能赚多少,赚的钱=2052-1600=452元

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