Build a Bridge Inc. started a contract in May $2023$ to build a small foot bridge at a fixed price of $$10$ million. The bridge was to be completed by September $2025.$ Total cumulative costs incurred by the end of December $2023$ and $2024$ were $$2$ million and $$5\mathrm{.}5$ million, respectively Build a Bridge Co$,$ is unable to estimate the total cost of the project prior to completion. Final costs at the end of the project totalled $$9$ million.