100,000,000,000 / 12 = would feed one person for 8.3B years.
Or a billion people for 8.3 years.
You can see where this is going.
$100B should be able to feed one hundred million people for 83.3 years. Assuming $100 / month could feed a person.
You can buy a lot of lentils, rice, and potatoes with $100.
But you're saying food stamps costs $100B a year.
Where is all this money going?