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$($a$)$ A Fleet Management Application has a reliability$/$availability of $99\mathrm{.}95\%.$ A proposal to improve the system by having a parallel system was envisaged. A legacy system is available with the company which will have no additional cost but has a reliability of only $50\%.$ Compute the overall reliability of the system if this system is introduced.

After introducing this system, the company was informed that all location updates need to be updated to individual fleet operators on a real$-$time basis. This system has a reliability$/$availability of $97\%.$ What would be the impact on system reliability$/$availability$?$