Heather's water heater needs repair.The plumber says it will

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/20 04:48:19

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?

Assume it takes n years:
In the case of having it repaired, in n years, the total cost would be: 300 + 75n dollars
In the case of buying a new one, in n years, the total cost would be: 500 + 75(1-60%)n dollars
300 + 75n = 500 + 75(1-60%)n
n = 40/9
If you have to use an integer for n, n would be 5 (the smallest integer greater than 40/9)

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