How much bank balance require visitors visa for Canada

[Rjit sunner]

hi sir, I hope you will give me right guideanc for my enquiry. I want to apply tourists visa Canada of my mom. But I don't have any idea about things. Besides this already my mom got rejected visa from this....the reason was that banks balance......so I want to know about that how much balance required for visitors visa....please help me and guide me....I am looking for your positive response....thanks u so much