美国入学考试数学题看不懂Phillip charged $400 worth of goods on his credit card. On his first bill, he was not charged any interest, and he made a payment of $20. He then charged another $18 worth of goods. On his second bill a month later

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美国入学考试数学题看不懂Phillip charged $400 worth of goods on his credit card. On his first bill, he was not charged any interest, and he made a payment of $20. He then charged another $18 worth of goods. On his second bill a month later
美国入学考试数学题看不懂
Phillip charged $400 worth of goods on his credit card. On his first bill, he was not charged any interest, and he made a payment of $20. He then charged another $18 worth of goods. On his second bill a month later, he was charged 2% interest on his entire unpaid balance. How much interest was Phillip charged on his second bill 这是题目
看了google翻译还是不知道该怎么算,要是不想翻译的就把数学式子列出来就好,让我默默参透

美国入学考试数学题看不懂Phillip charged $400 worth of goods on his credit card. On his first bill, he was not charged any interest, and he made a payment of $20. He then charged another $18 worth of goods. On his second bill a month later
Phillip用他的信用卡买了$400的东西,第一个账单日他不付利息,还了$20,又买了$18的东西.在他第二个账单日,他需要承担全部未付余额2%的利息.第二个账单日他需要付多少利息?

美国入学考试数学题看不懂Phillip charged $400 worth of goods on his credit card. On his first bill, he was not charged any interest, and he made a payment of $20. He then charged another $18 worth of goods. On his second bill a month later 美国高中入学考试.10题左右的英语物理题,想请懂英语和物理的同学解答. 一道数学题,看不懂题目, 实在看不懂这个数学题数学题有一步看不懂帮帮忙高中这个数学题我看不懂 . 一道数学题.15 解析看不懂. 初中数学题,解释一下,我看不懂如下图一个数学题看不懂, 我看不懂用美国语言怎么写 Phillip Phillips Gone Gone Gone 空间链接一道数学题,看不懂啊,想知道做又是数学题,怎么看也看不懂. 1道小学数学题（表示看不懂.）一道高等数学题 ,我步骤看不懂 sat数学题求教,我完全看不懂初中数学题老是看不懂怎么办尤其是实数 Phillip Schumacher 怎么读翻译成中文是什么名字.