AMC10 2011 A
AMC10 2011 A · Q1
AMC10 2011 A · Q1. It mainly tests Money / coins.
A cell phone plan costs \$20 each month, plus 5\cent per text message sent, plus 10\cent for each minute used over 30 hours. In January Michelle sent 100 text messages and talked for 30.5 hours. How much did she have to pay?
一个手机套餐每月费用20美元，加上每条发送的短信5美分，加上超过30小时的部分每分钟10美分。一月份Michelle发送了100条短信，并通话30.5小时。她需要支付多少钱？
(A)
$24.00
$24.00
(B)
$24.50
$24.50
(C)
$25.50
$25.50
(D)
$28.00
$28.00
(E)
$30.00
$30.00
Answer
Correct choice: (D)
正确答案：（D）
Solution
The text messages cost \$0.05 \cdot 100 = \$5.00, and the 30 minutes of excess chatting cost \$0.10 \cdot 30 = \$3.00. Therefore the total bill came to \$5 + \$3 + \$20 = \$28.
短信费用为$0.05 \cdot 100 = \$5.00$，超过30分钟的通话费用为$0.10 \cdot 30 = \$3.00$。因此总账单为$\$5 + \$3 + \$20 = \$28$。
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