How Much Per Unit 一个…多少钱

The usage of一(yí) 个(gè) …多(duō) 少(shǎo) 钱(qián):
(Unit + quantifier)
This pattern is used to compute the quality or frequency of an action per unit as a standard of measurement. It has two parts. The first part is the unit that the computation is based on, and the second part indicates the quantity or frequency of an action based on each unit.

Examples:
1, It costs US$500 for one airplane ticket.
飞(fēi) 机(jī) 票(piào) 一(yī) 张(zhāng) 五(wǔ) 百(bǎi) 美(měi) 元(yuán) 。

2, How much will it cost renting a single room in the downtown for a month?
在(zài) 市(shì) 中(zhōng) 心(xīn) 租(zū) 一(yí) 个(gè) 单(dān) 人(rén) 房(fáng) 一(yí) 个(gè) 月(yuè) 要(yào) 多(duō) 少(shǎo) 钱(qián) ？

3, Excuse me, how much does it cost for a day in a five- start hotel.
请(qǐng) 问(wèn) ， 五(wǔ) 星(xīng) 级(jí) 宾(bīn) 馆(guǎn) 多(duō) 少(shǎo) 钱(qián) 一(yì) 天(tiān) ？

4, How much does an apple cost?
一(yí) 个(gè) 苹(pín) 果(guǒ) 多(duō) 少(shǎo) 钱(qián) ？

5, It costs me 20 yuan taking a taxi to the airport.
打(dǎ) 的(de) 去(qù) 飞(fēi) 机(jī) 场(chǎng) 要(yào) 二(èr) 十(shí) 元(yuán) 。