[題目] 必考單字600 p101 價格折扣的說法
書名：必考單字600 p.101
想請益"價格折扣"的用法，題目來自第16~18題
16. ...... We have diving equipment on sale at 50 percent off.
17. ...... The prices of beds, mattresses, and bedroom furniture have been
reduced by 35 percent.
18. ...... All CDs, including classical, jazz, rock, and pop, are on sale
at three for the price of one.
疑問：
第16、17題應該是 5 折、 6.5 折，那第18題的用法應該怎麼解釋呢？
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