The price of 1kg salad is fixed. Someone took 9 dollars and went to the shop. Then, he found that he remembered a wrong price. The price he thought was $0.2/kg less than the actual price. As a result, the weight of the salad that he bought was 0.5 kg less than that in his mind. How much is the actual value of 1 kg salad?
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正确答案: E