The following table shows the daily receipts in millions of dollars of the movie "Avatar" for successive Fridays after its opening on Friday 13 December 2009. Weeks SReceipts 75.617 50.306 34.944 22.85 16.24 8.118 4.027 0.98 1.002 0.633 0.335 0.12 0.064 0.044 21 23 25 27 Estimate the instantaneous rate of change of daily receipts 23 weeks after the opening day. Round to four decimal places