This is actually basically how a lot of "hard iced tea" and "hard seltzer/wine coolers" type drinks are made. It's just the most flavorless piss beer with flavors added because that's cheaper than adding grain alcohol to thinks to spike it cleanly.
Hard liquor such as gin, rum, vodka or whiskey are usually bottled somewhere between 80 and 120 proof, or 40 to 60 percent ABV. Can you show me a wine cooler, malt liquor, hard soda or similar product that breaks even 10% ABV? Most beer is somewhere between 3 and 6% ABV.
Four Loko contains carbonated water, sugar, and natural and artificial flavoring including FD&C Red 40. The drink is sold at 6%, 7%, 8%, 10%,12%, 13.9% or 14% alcohol by volume (ABV), depending on state regulations, and is packaged in 23.5 oz (695 mL) cans.
14% seems to be the top end, not the bottom end, and not available everywhere at even that strength.
So in some markets Four Loko does break 10% but comes nowhere near 40%.
Now write me a 5 paragraph MLA formatted essay with at least 4 citations on what "showing your work" means to you.