$2.79, before taxes. Don't forget these are US companies. And any charges outside the US have likely already been taxed locally, before international tax was applied.
Don't ever assume the US gov is paying you fairly. Taxes are only an excuse for them to make even more money by manipulating the rules.
That's what I'm saying though, (as an American) if your baseline grocery budget is greater than the McD 'value meal', then you're likely just allotting your funds poorly.
The avg "$1 menu" item can be bought from your local grocer/butcher for as much as 1/4 price before seasoning. If you're "going to McD for savings" then you're the exact reason the world has the problems that it has.
Edit: "is decent" lmao have you ever had more than breadcrumbs? Imagine growing up in 'potato russia' and thinking your food has flavor.
Try tomatoes, try watermelon, try something and get out of your brainwashed ignorocracy.