How much does a glass greenhouse built by Qingzhou Changrong Greenhouse Engineering Co., Ltd. cost per acre: The total project investment consists of construction investment, interest during the construction period, and working capital. According to the nature of the costs, construction investment can be further divided into project costs, other construction-related costs, and contingency fees. Project costs include building engineering fees (including field engineering fees), equipment and tools purchase fees, and installation engineering fees. Based on the above provisions, the following basic equations exist:

① Total project investment = Construction investment + Interest during construction period + Working capital

② Construction investment = Project costs + Other construction-related costs + Contingency fees

③ Project costs = Building engineering fees (including field engineering fees) + Equipment and tools purchase fees + Installation engineering fees