Date Closing Price
January 11 $544.40
February 8 $549.75
March 15 $555.50
April 19 $624.75
May 17 $695.50
(a) Compute the average rate of change of the closing price from March 15 to May 17.
(b) From March 15 to May 17, the price of gold increased at an average rate of $ ? per day.
(c) Find the average rate of change from January 11 to February 8.