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Akramelmansi said:
Does anyone know how much money need to be in the bank account to apply for visitor visa

It depends how long you are planning on visiting.
 
I don't know what the norm is, but this was our situation:

Fiance had about 4000$ in his account when we applied for his TRV and he was granted a 3 year Multiple Entry. At the POE in Canada, he was asked again about his financial situation, he showed a bank statement that we had printed the previous day which showed that amount. I was also asked if I would provide and assist him once his money was spent, of course I said yes. He was stamped for 6months.

Hope this helps!