We just received our Pet Shop & Book Store “Your Business Math” books and the girls are already excitedly digging in. I’m not an accountant-type person and didn’t know how to answer my daughter’s question on the Ledger Entries. On the Ledger example it shows the inventory Money Out and Balance amounts, that I get, but we don’t see any explanation for the space following those amounts where the “00”, “20”, or “80” are, what do those numbers represent? A percentage of something? Is there an explanation of it somewhere in the book that I’m missing?