Accounting based question in the construction industry. Thanks in advance

Problem 2. The total cost of a sewage treatment plant with a capacity of 50 million gallons per day completed 2017 for a new town in Colorado was $4.5 million. It was proposed that a similar treatment plant with a capacity of 80 million gallons per day be built in another town in New Jersey for completion in 2021. For additional information given below, make a screening estimate of the cost of the proposed plant. - In the total construction cost in Colorado, an item of $300,000 for site preparation is not typical for similar plants. - The variation of sizes for this type of treatment plants can be approximated by the exponential law with m=0.5. - The inflation rate is approximately 5% per year from 2015 to 2025 . - The locational indices of Colorado and New Jersey areas are 0.95 and 1.10 , respectively, against the national average of 1.00 . - The installation of a special equipment to satisfy the new environmental standard cost an extra $200,000 in 2021 dollar for the New Jersey plant. - The site condition in New Jersey required special foundation which cost $500,000 in 2021 dollars