Bingo.... you decoded it. I feel thats how it works.So I think I understand how 50 per GB is calculated - 4GB for 4GB data + 8GB for Jio wifi spot = 12 GB. So 499/12 ~ 42 per GB. In the same vein the highest package - 4999/225GB (75GB + 150GB on hotspot) = 22 per GB. WTF!