a mathematicakl error any body can solve it?

Question

an ISP provider charges for internet usage to a customer as -for 2510 units=Rs1004 &1unit =0.40paisa.can u tell how many minutes is equal to 1unit?(hint: later a discount be given of for Rs1004 toRs999) that means for how many units & minutes this ISP provider calculating?

Answer 1

2510 units*0,40 paisa= 1004paisa =10,04 rupee in Pakistan
I think 1 unit is not in terms of minutes. It may be in terms of MB