Teacher Chen originally planned to buy six story books for Shujiao, each at 8 yuan, with a discount of 2 yuan for more than eight books. How much do you think he should buy?
If I were Mr. Chen, I would choose to buy eight books, because according to the original plan, if I buy six books at the price of each 8 yuan, then the budget for this purchase is 48 yuan. Buy eight books at a discount of two yuan each, which is six yuan each. If you buy eight copies, it's still 48 yuan. You can buy two more books without increasing the budget.