For the new applicants, I like to share one of my old comment :
There r some rules and something beyond rules. The minimum rule for funding is 1 year tution + 1 year living cost + return plane fare. U have to keep such amount of money in bank account as liquid or FDR for 4 months (I am not sure about this 4 months maturity period thing but keep it in mind for safety. Coz some successful applicant talked about it in this forum)
In Bangladeshi perspective, situation is quite different. The general rule is that you SHOULD show AT LEAST a year worth of money. But in that case, you should show that your sponsor has a continuous flow of income to sustain both you and his family with that money for the 2nd year (along with the first year too). Because if you show that you need suppose $24k and your sponsor is showing $24k, then they will reject the application because if the sponsor is showing that amount then how will he sustain his family back here AND how will he provide the money for the 2nd year.
So, it is always a safe bet to show the money for total living (most of the successful applications without scholarship show that). And that should be more than the expense obviously. So, you should show more then $48k, that way the VO will be convinced that your sponsor got enough money to sustain you and his family also. This is where many people get rejected although they show the right amount of money - "SUSTAIN BOTH YOU AND HIS FAMILY". Remember, everywhere it is written "FUND AVAILABLE" not "FUND YOU ARE WILLING TO SPEND" or something like that.
Another thing is, its always been better not showing any relatives in Canada. Because that will loose ur family tie with ur home country. VO maybe will think that u will never back to BD, ur main intention is settle down there.
Don't rely on any agency. Most of the BD agency r money suckers. They will lead u to a rejection and apply again and again to hold ur money in their account as FDR. That is their main business. Believe me.