The model that data entry jobs follow is really unique.
They have a fixed number of mistakes that are allowed per page. Additionally, they also have a minimum submission per month.
For example, if you sign up for 800 pages a month ( they have fixed packages) and you're promised 30Rs a page, that makes it 24,000 INR per month.
The Rs. 30 per page is valid for maximum one or two mistakes a page, wherein anything more makes the page invalid.
If more than a 100 or 200 pages have mistakes or, if you fail to submit more than those many pages, you aren't paid at all.
If you're late by a few days, around a 30%-50% is cut etc
You also have to pay a small amount when you're enrolling yourself ( Around 2.5-4K) which won't get refunded till you have had 4-8 proper monthly submissions.
Overall, if you're extremely particular and serious about the work, then yes, you can get paid that much.
This completely out of context, but if its only about the money, then I suggest you learn HTML & CSS( which together will take you approx a week) and freelance and make websites. You'll not only get paid much more, its an amazing skill to have. You'll improve your CV with it, And if you're lucky enough, you'll make a career out of it! :)