A company develops software using $4$ stages: devign, implementation, testing and release. Desien is directly followed by implementation and implementation is directly followed by testint, Testing might reveal problems related to design or errors related to implementation. In such cases, the corresponding stage is reviled. Oitherwise, the sof tware is releared. The company estimates that testing reveats design problems $10\%$ of the time and implementation errors $40\%$ of the time.

Question $1$: What is the average time implementation is visited?

Your answer: $0\mathrm{.}1429$

Question $2$: Knowing, that design, implementation, and testing cost on aver age are $10005,20008,$ and $5005$ respectively, find the average cost in $5$ of a released soltware.

Vour answer: $54400$