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Judy plans to visit the National Gallery once each month in 2012 except in July and August when she plans to go three times each. A single admission costs $3.50, a pass valid for unlimited visits in any 3-month period can be purchased for $18, and an annual pass costs $60.00. What is the least amount, in dollars, that Judy can spend for her intended number of visits? dollars
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解析：
根据题干可知，2012年，Judy共打算参观国家美术馆 16 次，那么根据题意，每次都购买入馆费的话需要花费16×$3.50=$56,这显然比办理年卡（$60.00）花费少；假如Judy在6-8月期间办理月卡，其余月份每次支付入馆费，那么她的总花费为$18+(9×$3.50)=$49.50；由此可见，最少的花费为$49.50。
根据题干可知，2012年，Judy共打算参观国家美术馆 16 次，那么根据题意，每次都购买入馆费的话需要花费16×$3.50=$56,这显然比办理年卡（$60.00）花费少；假如Judy在6-8月期间办理月卡，其余月份每次支付入馆费，那么她的总花费为$18+(9×$3.50)=$49.50；由此可见，最少的花费为$49.50。
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