Question: Vincent's bookstore is divided into different kinds of books. His top-selling books are fantasy books. He also sells literature books which cost half of the price of a fantasy book. If his fantasy books cost $4 each, and he sold five fantasy books and eight literature books per day, how much money will he earn after five days? Think carefully first, then make a decision:
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Vincent earns $4 x 5 = $20 for selling 5 fantasy books per day. The price of the literature book is $4 / 2 = $2 each. He earns $2 x 8 = $16 per day for selling 8 literature books. So the total money he earns per day is $16 + $20 = $36. Therefore, he will earn $36 x 5 = $180 after 5 days. So the answer is 180.
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