I am here to explain the mathematics behind these fraudulent Data Entry Jobs.
First thing that you all need to understand that when these companies ask for money (Suppose they ask for 3000 Rs ), and then they assign you the job, then don't think that you are the only one assigned that task. They assign the same task to 10 other innocent people like you who have paid too (10*3000 = 30000 Rs.). Then of course, their tasks are not that easy one. Only 1 out of those 10 person is able to complete it on time, let go of the accuracy. Then these companies give half of the earned amount above (15000 Rs.) to that 1 person, while all the rest lost their money. But company gains 15000 Rs. from these innocent people too, and will get more money from companies whose data entry that person has performed. Such basic mathematics, these fraudsters do to play with money of innocent people. They investment nothing, still makes money by cheating.