A contractor must install $51,755$ If of silt fence for a new $300$ acre industrial site being constructed. The contractor bid the project at $$\frac{7\mathrm{.}28}{?}$ If$.$ If the contractor has $10$ working days to complete the installation, and the contractor assumes the same amount of work will be performed each day to complete the work, but by the end of day $5,$ the contractor has spent $$180,303,$ what will the CPI for the project be to that point?