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There is no fixed amount of money that is considered 'enough' by the UK visa office.
This is because the amount of money needed varies with many factors. If you are staying in the UK longer you will need more money, but also if you are staying in London hotels, or travelling around by private car, you will need more than if you are staying with a relative who will put you up for free. You should work out how much money you will actually need for the trip, and make sure you have that much available.
Also (and this is very important) the check on your finances is about more than just 'do you have the right amount of money in your account'. They will check that you have the money, that it is actually yours, and that it is a reasonable amount of money for you to pay in your circumstances.
So you will need to submit your own accounts, for some time back. If your mother or father is paying towards this trip they will also need to submit all their accounts, not just the 'fixed account' that the money is coming from. They will need to state their incomes and expenses, and show that they amount they are paying is not excessive.
The question also indicates that you or your parents might be considering adding to the account to make it seem like you have more money. Do not do this. It's a well-known pattern of deception and will get you refused (even if you were not intending to deceive anyone). If you (or your parents) have had significant deposits to their accounts recently, be sure you explain where it came from (and offer evidence to back that up).