[問題] 請問信用卡停車
小弟數學不好，看不懂停車費算法，有前輩能幫忙解說嗎，130跟90是怎麼算來的
～～～～～～===
假設某停車塲當日最高上限是 250 元，你手上持有每日每次最高 3 小時免費停車的信用
卡，而該停車場每小時為 40 元，那麼在 8 小時後離場，意味著你只需額外支付 130 元
就能離開停車場。至於每日每次最高 4 小時免費停車的信用卡，那就只需額外支付 90
元就能離場。
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