Consider the following graph where the prices of timber are given, for the period 1997- 2003. The prices for plywood and sawn timber are given in Rs. 1 ton while the price of logs is given in Rs per cubic meter. Assume 1 ton is equal to 1,000 kg and one cubic meter of Log weighs 800 kg.
Timber Product Prices
   prices
                        years
In 2004, the prices of plywood, sawn timber and logs went up by 5%, 1% and 10%, respectively, and the total sales were made up of 40% plywood, 30% sawn timber and 30% logs. The average realisation per cubic metre in 2004 was closest to
