The following table shows the daily receipts in millions of dollars of the movie "Avatar" for successive Fridays after its opening on Friday 18 December 2009. Weeks $Receipts 77.025 3 50.306 6. 31.28 16.24 12 6.526 15 0.98 18 0.92 21 0.335 24 0.076 27 0.044 Estimate the instantaneous rate of change of daily receipts 21 weeks after the opening day. Round to four decimal places.

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