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  The following table shows the prices of three types of raw materials used by manufacturing plants and the quantities used in the two years 2004 and 2005:

Year                                                    2004                                                                2005

Groups                        Prices              Quantity used                          Prices              Quantity used

(£)                    (000s)                                      (£)                                (000s)

Coal (tonnes)               20                    40                                            30                                30

Oil (barrels)                75                    80                                            80                                80

Iron ore (tonnes)         40                    96                                            36                                98

(i) Construct a simple aggregate index of raw material prices for 2005, using 2004 as the base year.

(ii) Construct a Laspeyres index of raw material prices for 2005, using 2004 as the base year.

(iii) Construct a Paasche index of raw material prices for 2005, using 2004 as the base year. 

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