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What is the cost of heating a hot tub containing 1400 kg of water from 11.0°C...

What is the cost of heating a hot tub containing 1400 kg of water from 11.0°C to 40.0°C, assuming 79.0% efficiency to account for heat transfer to the surroundings? The cost of electricity is 10.2 cents/kW·h.

What current was used by the 220–V AC electric heater, if this took 4.30 h?

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What is the cost (in $) of heating a hot tub containing 1460 kg of water...
What is the cost (in $) of heating a hot tub containing 1460 kg of water from 10.0°C to 40.0°C, assuming 75.0% efficiency to account for heat transfer to the surroundings? The cost of electricity is 9.00 cents/(kW · h). What current (in A) was used by the 220 V AC electric heater, if this took 3.75 h?
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