If you could please show calculations and where the numbers came from, that would be great.

Slow Corporation plans to sell 24,000 units of Product A during July and 30,000 units during August. Sales of Product A during June were 25,000 units. Past experience has shown that end-of-month inventory should equal 3,000 units plus 25% of the next month's sales. On June 30 this requirement was met. Based on these data, how many units of Product A must be produced during the month of July