PMP Exam Simulator

You are managing a project to professionally paint kitchen cabinets for all apartments in a residential community. Besides the number of cabinets in the kitchen to be considered, there’s also cost of the materials to paint the cabinets such as primers, brushes, paint and equipment for sanding. Today you have presented the project cost estimates to the sponsor. Unfortunately, the sponsor is not happy with the estimate as he thinks it's not accurate as it could be. Which technique can help you most in this situation?