A store sells CDs at one price and DVDs at another price. The figure below shows the revenue (in dollars) of the music store as a function of the number, c, of CDs and the number, d, of DVDs that it sells. The values of the revenue are shown on each line. 400 (a) What is the price of a CD? (b) What is the price of a DVD? 300 200 100 2000 1000 3000 100 4000 5080 200 6000 7800 dollars dollars 8800 300 с (Hint: for this problem there are many possible ways to estimate the requisite values; you should be able to find information from the figure that allows you to give an answer that is essentially exact.) 40€

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