Making Comparisons
Ratios
Percentage Changes
Index Numbers
Index Numbers
Revenue = price per item x no. items sold £/mth
Index Numbers
An Index Number is a ratio expressed as a percentage
Without % symbol
The reference points - called the base
Always takes the value 100
Index no. = value at time divided by value at reference time x100
Index Numbers
Monitor variation in the value of groups of items
Retail Price Index (RPI)
Monitor the cost of a basket of goods/services
Aggregated and weighted index number