The following table shows the daily receipts in millions of dollars of the movie "The Hunger Games" after its opening on 23 March 2012.

Days$Receipts
1433.111
2814.666
425.587
562.95
701.567
840.852
980.397
1120.279
1260.518


Find the average rate of change of the daily receipts from day 28 to day 56.
$   millions / day