“Gross profit” is a meaningless number in this context. Their net income was $15.5B. If you do the same math to try to determine profit per location, ($15.5B/10500) it’s about $1.48M. Not bad, but still about 90% lower than your estimate.

Since I was already estimating seemingly random profit ratios, I also looked at their profit per employee, which came out to $7380/person ($15.5B/2.1M employees).

Unfortunately these numbers are also inclusive of, for example, Walmart’s e-commerce program, so calculating the profit per location doesn’t indicate anything meaningful to me, though I’m morbidly curious about what insights you are hoping to get from it?