Based on the information provided, the estimated budget for this contract can be determined by considering the minimum and maximum quantities of each item and the corresponding unit prices. However, as the unit prices are not specified, we can estimate the budget based on industry standards for similar contracts. For example, the average cost of ventilation ducting can range from $100 to $500 per unit, depending on the type and material. Assuming an average unit price of $200, the total budget for the first year could be estimated as follows: Minimum quantity: 1,135 units (sum of minimum quantities for all items) * $200/unit = $227,000 Maximum quantity: 20,500 units (sum of maximum quantities for all items) * $200/unit = $4,100,000 Considering the option years, the total budget for the five-year contract could be estimated as follows: Minimum quantity: $227,000/year * 5 years = $1,135,000 Maximum quantity: $4,100,000/year * 5 years = $20,500,000 Therefore, the estimated budget for this contract could be between $1,135,000 and $20,500,000, depending on the actual quantities ordered and unit prices.