15.11.2013, 19:26
First, write in copybook or whatever you write in your own closed system.
For example, a cow Moomoo gave a bucket of milk at the farm. this bucket has been delivered to the seller. He sold this milk, got a little part of money as his salary and most of money has been returned to farm, which bought some grass (or what do cows else eat?) for Moomoo and left $10 for itself. Again, Moomoo ate grass and gave another bucket of milk.
For example, a cow Moomoo gave a bucket of milk at the farm. this bucket has been delivered to the seller. He sold this milk, got a little part of money as his salary and most of money has been returned to farm, which bought some grass (or what do cows else eat?) for Moomoo and left $10 for itself. Again, Moomoo ate grass and gave another bucket of milk.