Heather's water heater needs repair.The plumber says it will cost $300 to fix the unit,which currently costs $75 per yea
Heather's water heater needs repair.The plumber says it will cost $300 to fix the unit,which currently costs $75 per year to operate.Or Heather could buy a new water heater for $500,including installation and the new heated would save 60% on annual opearating costs.How long would it take for the new unit to pay for itself?
英语人气:444 ℃时间:2020-01-28 13:07:41
优质解答
Assume it takes n years:In the case of having it repaired, in n years, the total cost would be: 300 + 75n dollarsIn the case of buying a new one, in n years, the total cost would be: 500 + 75(1-60%)n ...
我来回答
类似推荐
猜你喜欢
- 1Relaxing from time to time is important to us.(保持句意)
- 2关于英语动词时态和语态的十一个问题 1.(A)When and where to build the new school______.A.is not de
- 3Were there many tall buildings?
- 4f(x)是定义在R上的奇函数,当x>0,xf'(x)+f(x)>0,且f(1)=1,则不等式f(x)>1/x的解集为
- 5在化学里4H表示什么意思
- 6斤字旁(在左) 加个耳刀(在右),念什么?
- 7词语搭配 ,如改善(生活),30个!急!
- 8用理想气体状态方程式算40升气瓶在15兆帕的压力下可充装氮气多少立方米?
- 9计算. 400-(1300÷65+35) 40-(3.5-2.75+0.86) (200+350)÷11×38 720-(750÷15+248)
- 10物体A重GA=40N,物体B重GB=20N,A与B,B与地的动摩擦因数相同,用水平绳将物体A系在竖直墙壁上,水平力F向