Question: I'm evaluating two annuity products that each pay ₹1,00,000 a year for 10 years at a 9% discount rate — one pays at the start of each year, the other at the end of each year. What's the present value of each, and how much extra is the "start of year" version really worth?
Answer: Present value (payments at year-end, ordinary annuity) ≈ ₹6,41,766. Present value (payments at year-start, annuity due) ≈ ₹6,99,525. The annuity-due version is worth approximately ₹57,759 more.

Supporting evidence:
title: Inline formula / method note
quote: Standard present value of annuity (ordinary vs. annuity due) formulas — time value of money mathematics
context: Standard present value of annuity (ordinary vs. annuity due) formulas — time value of money mathematics.