A ticket has 5 grand prizes ($100,000) with 1-in-500,000 odds:
Total Tickets Printed = 5 × 500,000 = 2,500,000 tickets
We calculate this for multiple prize tiers and take the median.
7,000 of 10,000 total prizes have been claimed (70%):
Remaining Tickets = 2,500,000 × (1 - 0.70) = 750,000 tickets
$400,000 in unclaimed prizes, 750,000 tickets remaining, $5 ticket cost:
Return Rate = ($400,000 / 750,000) / $5 = 10.7%