What exactly is wrong and is it easily fixed on my Honda CBR 250R 2013?

Hi,

I have a cbr250 and one day i found it laying down (possibly overnight). When i picked it up there was gas on the floor and i noticed theres a tube sticking out that looks disconnected (maybe cut clean). The bike started at first then eventually just cut out and died. Now it won't start.
What's wrong with it?
Is it an easy fix?
If it is the gas line is that easily replaceable?
Last, regardless of what you think it is, can you quote me a price of how much you think it would cost at a mechanic?

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