Probably price of AIO pack will also increase. Consider atleast a 50rs increase in other packs. Take 399 pack, it may become 449.
So 449 plan -1.5GB/day without offnet calls for 84days(As per the hint 1.5 GB can be 1GB/day)
AIO 444 plan - 2GB/day + 1000 offnet minutes for 84 days.
So while comparing both plans what value does 449(399) plan keeps?