second the rest
Indeed, the food supply is set up wrong, and that costs money. I also never get further than 37.000 points, because whatever I try, I cannot set up enough defence for that wave. They always break through. Correcting the food supply so it diminishes according to the actual population might be all that is needed, as it certainly saves on the money. I end up every time having to build 8 farms at least for 1000 people...