What Is Closing Stock, Matched Expenses, And Profit In The Following Transaction? How To Calculate?

Hi! Friend, the ans of this question is,
 
Purchases   10000
Sales   9000
Cost of sales   6000
 
 
 
Ending Inventory= Opening Inventory(if any)+Purchases-   Cost ofgoods sold
  = 10000-6000
Ending Inventory = 4000
 
Profit   = Sales- cost of sales
  = 9000-6000
Profit     = 3000
 
Here 1000 is nothing, its a confuson in your mind. And Purchases are categorized in Expenses. And revenue here is the synonym of Profit.