The granary can carry maximum half of the required food to grow.
In that case, the food to grow is 30, so 30/2 = 15
Each turn, you store your food surplus.
If food surplus = 0, you've stored 0...
If food surplus = x, you've stored x... not x/2.
In that case, the food to grow is 30, so 30/2 = 15
Each turn, you store your food surplus.
If food surplus = 0, you've stored 0...
If food surplus = x, you've stored x... not x/2.