The price and the power consumption of two different models of air purifiers are shown.
\[ \begin{array}{|l|l|} \hline \text{Air Purifier X} & \text{Air Purifier Y} \\ \hline \text{Price: \$480} & \text{Price: \$462.40} \\ \hline \text{Power: 95 W} & \text{Power: 88 W} \\ \hline \end{array} \]
The average cost for electricity is 30c/kWh. A household runs an air purifier for an average of 10 hours a day.
- The annual cost of electricity for Air Purifier X for this household is \$104.03.
- For this household, what is the difference in the annual cost of electricity between Air Purifier X and Air Purifier Y? (2 marks)
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- For this household, how many years will it take for the total cost of buying and using Air Purifier X to be equal to the cost of buying and using Air Purifier Y? (2 marks)
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