If the sales revenues in the years 2005 2006 and 2007 increase by 20%, 25% and 30% respectively and the costs of production in the years 2007, 2008 and 2009 Increase by 20%. 25% and 35% respectively, what will be the difference between average sales revenue and average cost of production?

In which year the company had maximum profit percent ? 

If the cost of production in 2004 and 2007 be increased by 25% and 30% respectively. then by what percent will the total cost in these both years be more than the sales revenue of the year 2008? 

In how many years the sales revenue is less than the average sales revenue of the given years ? 

In how many years the cost of production is more than the average cost of production of the given years ? 

By what percent is the amount received from the sales in the year 2005 of the company. more than the expenditure on production in the year 2008?