i need the cash budget with there procedures or formulas

The actual sales and purchases for Xenocore, Inc., for September and October 2012, along with its forecast sales and purchases for the period November 2012 through April 2013, follow. The firm makes 20% of all sales for cash and collects on 40% of its sales in each of the 2 months following the sale. Other cash inflows are expected to be$12,000 in September and April, $15,000 in January and March, and $27,000 in February. The firm pays cash for 10% of its purchases. It pays for 50% of its purchases in the following month and for 40% of its purchases 2 months later. Year 2012 2012 2012 2012 2013 2013 2013 2013 Month September October November December January February March April Sales $210,000 250,000 170,000 160,000 140,000 180,000 200,000 250,000 Purchases $120,000 150,000 140,000 100,000 80,000 110,000 100,000 90,000 Wages and salaries amount to 20% of the preceding month's sales. Rent of $20,000 per month must be paid. Interest payments of $10,000 are due in January and April. A principal payment of $30,000 is also due in April. The firm expects to pay cash dividends of $20,000 in January and April. Taxes of $80,000 are due in April. The firm also intends to make a $25,000 cash purchase of fixed assets in December. The firm has a cash balance of $22,000 at the beginning of November. The firm wishes to maintain a $15,000 minimum cash balance. Prepare the cash budget