the prices for several "staple" food items for the years 2000 and 2009. compute the simple average price index for this group of items using 2000=100.

bread= 0.89 (2000) 2.35 (2009)

milk= 0.92 (2000) 1.80 (2009)

eggs= 1.70 (2000) 1.83 (2009)

flour= 5.95 (2000) 9.97 (2009)

butter 1.73 (2000) 2.47 (2009)