Jefe Pesos, a (hypothetical) American billionaire, earned US $100 billion (that's US $100,000,000,000) in the first year of the Covid-19 pandemic. Suppose he could actually spend all this money. Would he have been able to pay for the basic food costs for the poorest 10% of children in the US, for whom hunger is a constant concern, for one year? Use Fermi estimation.

(Please show your work and write down all of your assumptions. You are not allowed to look up any values for this problem. You will primarily be graded on the process of your Fermi estimation, not the accuracy of your answer.)