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A family pays ? 1000 for electricity on ...

A family pays ? 1000 for electricity on an average in those months in which it does not use a water heater. In the months in which it uses a water heater, the average electricity bill is ? 1240. The cost of using the water heater is ? 8.00 per hour. Find the average number of hours the water heater is used in a day.

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