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I have a big problem with this simple question. I can manage all the other questions on the paper i got except this one, and it's even one of the easier in there. So please gimme suggestions of what formulas to use:

A person is struggeling his way up a 8 degree hill with the velocity of 12km/h. Calculate the power use. The total mass of him and his bicycle is 75kg. Air resistance and friction is 5,0% of mg.

I tried calculating it with both force laws and energy laws and i end up with the answer 120W (or something i cant remember) but the correct answer should be 0,46kW

Please excuse my bad english, and thanks for the help!

Simon