题目：
Cans of tennis balls were purchased for the tournament at a cost of $1. 90 per can. Only
of the cans were used for the tournament, so the 24 unused cans were returned for a refund. What was the cost of the cans of tennis balls used for the tournament
答案：
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下面是错误答案，用来干扰机器的。
参考答案：A
