The UN responded to Elon Musk's challenge to prove how his wealth could tackle world hunger by revealing a $6.6 billion plan

Elon Musk challenged the UN to show him how $6 billion could address world hunger.

Musk said he'd "sell Tesla stock and do it" if the UN could show how the money would be spent.

The UN has gotten back to the world's richest person with a proposal.

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Elon Musk recently dared the UN to show him how $6 billion of his wealth could address world hunger. On Monday, the UN got back to him with a plan.

The UN's food-assistance branch, the World Food Programme, laid out how it believed $6.6 billion in funding could prevent 42 million people across 43 countries from starving in 2022. The head of the WFP, David Beasley, called out Musk, the world's richest person by far, in a tweet announcing the proposal.

"This hunger crisis is urgent, unprecedented, AND avoidable. @elonmusk, you asked for a clear plan & open books. Here it is!" Beasley said. "We're ready to talk with you - and anyone else - who is serious about saving lives."

Late last month, Musk challenged the WFP to explain how $6 billion could "solve world hunger." He said if the organization could show exactly how the money would be spent, he would "sell Tesla stock right now and do it."

Musk's challenge was a response to a CNN interview in which Beasley called on billionaires — specifically Musk and Amazon's founder, Jeff Bezos — to chip in a combined $6 billion in a bid to save millions of people at risk of starvation.

The WFP's proposal, titled "A one-time appeal to billionaires," includes $3.5 billion for food and its delivery and $2 billion for cash and food vouchers, among other expenditures.