1. Next week you have to travel around parts of the country on business and have decided to hire a car from a car-hire company. You have contacted two companies which offer different services. The first company will rent you a car for $125 per day. The second company will charge $80 per day, but with an additional charge of 50 cents per kilometer travelled. You know you will require the car for four days but are unsure of the number of kilometers that you will cover.
(a) Determine mathematically what distance you need to cover to make the second company’s charge cheaper.
(b) Confirm this using Excel graphs.
(c) Both companies now realise that they will need to add 10% GST to the charge for the daily car hire, but not to the charge for the kilometres covered. How will this affect your decision? Justify your answer with both the calculations and Excel graphs.
不明白怎樣做excel,請幫忙!!
請各高手多多幫忙,感激萬分.
statistics 不識做,pls help!!急!!
2009-01-28 1:44 am
回答 (2)
2009-01-28 3:30 am
✔ 最佳答案
(a) Let you travelled x km in four daysThen if the second company’s charge cheaper.
80*4+0.5x<125*4
320+0.5x<500
0.5x<180
x<360
So, the number of kilometers that I will cover should be less than 360 km
(b)
Just using the following data to draw the graph
Distance Money
100
370
110
375
120
380
130
385
140
390
150
395
160
400
170
405
180
410
190
415
200
420
210
425
220
430
230
435
240
440
250
445
260
450
270
455
280
460
290
465
300
470
310
475
320
480
330
485
340
490
350
495
360
500
370
505
380
510
390
515
400
520
Comfirm that if the distance is larger than 360 km, then the second one is more expensive
(c)
For plan 1, the total charge becomes 125*1.1*4=550
For plan 1, the total charge becomes 80*1.1*4+0.5x=352+0.5x
Let 352+0.5x<500
x<296
So the number of kilometers that I will cover should be less than 296 km
2009-01-27 19:32:18 補充：
X<396 for (c)
2009-01-30 2:24 am
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我有網站可以賺錢和創業。
www.money128.biz和www.fast - beauty.6289.us
我還有美容產品可以免費試用詳情
請發送電子郵件給我。
[email protected]
感謝你。
收錄日期: 2021-04-12 14:29:33
原文連結 [永久失效]:
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