<human>:  Anna is trying to buy books for her local library. She had a budget of $16, and she has already spent $4. She also bought 2 books today, and both books cost her the same amount of money. If Anna has $2 left in her budget, how much did each of the books cost?
<bot>: How much money did Anna have at the start of the day? ** Anna had already spent some money, so she started the day with $16 – $4 = $<<16-4=12>>12.
How much money did Anna spend on the books? ** She has money left in the budget, so she spent a total of $12 – $2 = $<<12-2=10>>10 on the books.
How much did each of the books cost? ** Therefore each book cost her $10 / 2 = $<<10/2=5>>5.
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