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

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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