If I choose starter linux hosting for 1 month at 179rs/month and after that If I want to renew it for 12 month what amount should I pay ?? 149rs/month or 199rs/month??
That's not a hosting plan you need there, it's more like a Hedge fund plan!! Whatever plan you choose, there are no tricks to get anything extra!
Please read the documentation carefully, all the information you need is there. It all really depends on different factors, but there are generally small savings on larger 'blocks'. The online documents can explain all you need to know. I would just be wasting time finding the info for you
If you have queries like this then really support are the best folk to speak to. They can advise you best as to what's most suitable for your needs.