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

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 there's 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?

Reconnect the gas line, will cost you $0. Or of you can't find your gas tank and carburetor pay a mechanic $100 to do it for you.

Wow, maybe see where that hose was connected, which my guess is the gas tank. Connect it and fill it with gas and low and behold it should be fixed

Your gas line should be okay, that loose tube is an overflow tube for when the carb float gets stuck open and is supposed to have an open end.
Before doing anything else unscrew the engine oil refill cap and smell the oil on the dipstck, if it smells of fuel change the engine oil as soon as possible, that fuel is not good for the wet-clutch.

After that try starting it again and if a 'no-start' pull out the spark plug to see if it has fuel or a lot of fuel.

Mechanic wages vary from area to area but figure $ 65-80(US) per hr. With some shops charging a 3 hour min.

Like dude, does the tube smell, like, gasoline? Take on the arduous task of fixing it yourself.

Sounds like a line has popped off the fuel tap, though not sure how just by falling over. Make sure it is pressed firmly back onto the tap and fit a new spring clip if the original is AWoL. Prime the carbie and try starting it again. If the bike has been on it's side also check the oil level and battery level to make sure your fluid levels are still OK