The mean salaries of a type of office worker between 2006 and 2015 are:1527; 1531; 1543; 1563; 1579; 1579; 1602; 1628; 1629; 1632

a)Calculate an index which shows the changes in mean salary with reference to the base year 2006. b)How would the index change if we changed the base year to 2008?

c)If the index of prices went up by 10% in the period 2006-2015, how much money did these office workers gain in real terms in this period?