physics
posted by Aaron .
The table shows the power ratings of four electrical appliances.
Fan heater 2 kW
Oven 3 kW
Kettle 2 kW
Microwave oven 0.75 kW
The kettle is used for a total of 30 minutes a day. It has an efficiency of 0.9
What is the cost of the energy wasted by the kettle each day?
1 0.6 p
2 1.0 p
3 6.0 p
4 9.0 p
please can someone post a walkthrough of the answer along with the answer please, Thanks in advance.

Anyone? ive got a test tomoz and i need this answering