After my exprince in simple way if you are looking a laptop under 45k then go for itlenovoG50-80 Notebook.
it comes with an Intel 5th Gen, processor and with 2GB graphic card.
and the best part is about notebook is the battery output it gaves you easily 5 hrs battery backup after my self experience. comes along microsoft office 365.
If we atalk about sound portion it is neither so high nor too much low but the presence of dolby has improved the sound quality and that has no doubts.
overall this laptop has good configration under 45k in simple way go for it it wil never disappointment you.
beside of this mouthshut.com support and delivery service is also good( product comes on expected date).