I need help understanding this question

"you are working on a bid to build four small apartment buildings a year for the next three years for a local community. This project requires the purchase of 900k worth of equipment which will be depreciated using straight-line depreciation to a zero book value over the three years. The equipment can be sold at the end of the project for $400,000. You will also need $200,000 in net work capital over the life of the project. The fixed costs will $475,000 a year and the variable costs will be $140,000 per building. Your required rate of return is 12% for this project and your tax rate is 34%. What is the minimal amount, rounded to the nearest $500 that you should bid per building?"

The answer is: $341,500 but I honestly have no idea how to get that answer.