Comma Manufacturing budgets on an annual basis for its fiscal year. The following beginning and ending inventory levels are planned for the fiscal year of July 1, 2012 to June 30, 2013:

Raw Materials June 30, 2013 June 30, 2012

3,000 kilos 2,000 kilos

Three kilos of raw materials are needed to produce each unit of finished product. If Comma Manufacturing plans to produce 560,000 units during the 2012-2013 fiscal year, how many kilos of materials will the company need to purchase for its production during the year?

Answer: 1,681,000 kilos

could you explain me why?