TechSolve Inc. is a dynamic tech startup specializing in the development of cutting-edge software solutions. They are currently managing a project to create an innovative mobile app aimed at enhancing workplace productivity. As the project manager, your role is pivotal in ensuring the success of this venture. 

a. Explain the stages of group development, and discuss how understanding these stages can facilitate effective project team management within the context of the TechSolve Mobile App Project. 

b. Determine the risk factor and assess the level of risk for the TechSolve Mobile App Project. Assuming your project team has established the following risk values: Probability of Project Delay (Pd) = 0.2 Probability of Budget Overrun (Pb) = 0.4 Consequence of Delay (Cd) = 0.6 Consequence of Budget Overrun (Cb) = 0.8 c. 

The software development team for the mobile app has identified four key project phases. The estimated time to complete each phase decreases by 15% as the team gains experience. If the steady-state time to complete a phase is 30 days, calculate the time required for the first phase of the TechSolve Mobile App Project.