please answer the question, see image with diagram:

please answer the question, see image with diagram:

https://s.yimg.com/hd/answers/i/5f1326513405481c8b60bd85a7001e5b_A.jpeg?a=answers&mr=0&x=1455217785&s=6ca2c8e65d64dabf0cc0f686eea5750b
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find the cost of your paper