Direct and Inverse Proportion

Direct and Inverse Proportion

IP 2

A printing service charges a fixed setup fee plus a constant price per page. Printing \(20\) pages costs \(\$7\); printing \(50\) pages costs \(\$13\).

  1. Find the setup fee and price per page.

  2. A student uses direct proportion to predict that 100 pages cost $26. Find the actual cost and the error in the prediction.

  3. Define a new quantity involving total cost that is directly proportional to the number of pages.

Solution:

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Answer:(a) \(\$3\) and \(\$0.20\)/page; (b) \(\$23\), overestimate \(\$3\); (c) \(C-3=0.2n\).

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