Question: Each month, Zhang's internet plan costs 80 dollars for the first 30 gigabytes per month, plus 3 dollars for every gigabyte over 30 up to

Each month, Zhang's internet plan costs 80 dollars for the first 30 gigabytes per month, plus 3 dollars for every gigabyte over 30 up to 65, and then 7 dollars for every gigabyte over 65. How much will Zhang pay in a month where he downloads 11 gigabytes? How much will Zhang pay in a month where he downloads 43 gigabytes? How much will Zhang pay in a month where he downloads 71 gigabytes? Suppose D(a:) is the cost of downloading :c gigabytes in a month
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