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Mr. Tank has an old gas water heater that cost him $685/year to operate. He purchased a new one for $1875 that will save him 33.87% annually and energy cost to run in how many years will the new water heater pay for itself? Round to the nearest whole year

Respuesta :

Answer:8 years

Step-by-step explanation:

Given

Old water heater cost [tex]\$ 685[/tex] per year

New Heater cost [tex]\$ 1875[/tex] and save 33.87%

So New heater cost Annually [tex]=685\times (1-.3387)[/tex]

New heater cost[tex]=\$ 452.99[/tex]

Saving per year [tex]=\$ 232[/tex]

So it will pay for itself after [tex]=\frac{1875}{232}=8.018\approx 8\ years[/tex]

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