Last year, I paid the $2/chick at the feed store and then $6 on feed to get the first pullet to point of lay at 21 weeks.
The laziest one out of the bunch cost me the same $2 but her share in the feed bill was nearly $9 by the time she kicked in with her share of rent & living expenses
at 26 weeks. (They eat quite a bit more between 21 & 25 weeks than they did when they were little ones.)
After these expenses, the laying pullets have been kept (not
religiously, but close) to 1/4 pound of commercial feed each day. The way I do that is by weighing the feeder when it is refilled each afternoon. If they've eaten more than 1/4 pound each, they get lots of goodies from the kitchen. I also count scratch with these goodies/treats.
If they haven't averaged 1/4 pound each for the day, they don't get treats that evening. It is kind of equivalent to your mom saying "if you clean your plate, you can have dessert." But, dessert can be all sorts of things like veggies and such. In fact, they are out every day getting their own dessert in the yard. But for the most part, that 1/4 pound of commercial feed is what they are living on.
Oh, and they are pullets of large breeds. Yeah, they've always "cleaned their plates" by evening
. Hope this helps.
Steve
edited to say: Your bags are probably 25 kg. That's 25,000 grams. A 1/4 pound is less than 120 grams but let's say 125 grams. So, you've got 200 "chicken days" in each bag, if you feed like I do. I'll let you figure out how much each chicken is costing you for each day, from there.