What would be the correct equation for the budgeted cost of goods sold?

Iguana, Inc., manufactures bamboo picture frames that sell for $30 each. Each frame requires 4 linear feet of bamboo, which costs $3.00 per foot. Each frame takes approximately 30 minutes to build, and the labor rate averages $11 per hour. Iguana has the following inventory policies Ending finished goods inventory should be 40 percent of next month's sales. Ending raw materials inventory should be 30 percent of next month's production. Expected unit sales (frames) for the upcoming months follow: March April May June July August 300 300 350 450 425 475 Variable manufacturing overhead is incurred at a rate of $0.30 per unit produced. Annual fixed manufacturing overhead is estimated to be $9,600 ($800 per month) for expected production of 4,000 units for the year. Selling and administrative expenses are estimated at $850 per month plus $0.60 per unit sold. Iguana, Inc., had $12,800 cash on hand on April 1. Of its sales, 80 percent is in cash. Of the credit sales, 50 percent is collected during the month of the sale, and 50 percent is collected during the month following the sale Of raw materials purchases, 80 percent is paid for during the month purchased and 20 percent is paid in the following month. Raw materials purchases for March 1 totaled $3,500. All other operating costs are paid during the month incurred. Monthly fixed manufacturing overhead includes $200 in depreciation. During April, Iguana plans to pay $3,500 for a piece of equipment