# For individual or collaborative investigation (Exercises 57-60)Ifp units of an item are sold for x dollars per unit, the revenue is R px. Use thisidea to analyze the following problem, working Exercises 57-60 in order.Number of Apartments Rented The manager of an 80-unit apartment complexknows from experience that at a rent of \$300, all the units will be full. On the average, one additional unit will remain vacant for each \$20 increase in rent over \$300Furthermore, the manager must keep at least 30 units rented due to other finan-cial considerations. Currently, the revenue from the complex is \$35,000. How manyapartments are rented?

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Hi, the problem in the image is confusing. How do I set this pre-problem (before 57-60) up, and how do I solve it? I have tried to solve it but am left confused in the middle of the problem.

I have a test on Monday so if you can solve this before 9/21/19 that would be great.

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Step 1

To find the number of apartments which have been let under the  given conditions

Step 2

Work out the rents from the 30 and the remaining nu...

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