M:How much did you pay for this novel W:I pay 4 dollars..But

M:How much did you pay for this novel W:I pay 4 dollars..But it is one-third off the regular
price
Question:How much did the novel cost at the regular price?
这题的第二句话没有理解,那价格应该是多少钱
为什么答案是6元啊,难道答案印错了吗,我算出来也是12元