Here the exercicse $2$ attached.

Ex $1$: A company decides to release a new product. There is $6$million euros cost for development. The selling price will be $18.$The company contemplates three different scenarios: good, fair and bad; with probabilities $0\mathrm{.}45,0\mathrm{.}35$and $0\mathrm{.}2.$The associated sales to these three scenarios are $600,300,$and $90$thousand units, respectively. Ex $2$: Let us reconsider the previous example, but now allow for the chance that the product will be a fail for technical reasons. The probability of failure is $0\mathrm{.}2.$The $6$million of development is now split into $4$million for development; and $2$million for marketing $($only to be incurred if the product development is successful$).$All other data are the same. $$Modify Example $2$of the materials discussed in class. Assume no consulting services are available yet.$$Allow for two levels of technological failure: minor technical failure with probability $30\%$; and design failure with probability $10\%.$In the first level, the company can pay a further development cost$$D$$to fix the product and make it a technological success. Then they decide whether to market the product or not. In the second level $($failure$),$the project must be abandoned.

Modify the decision tree accordingly. $($do it really graphically$)$

Find the value$($s$)$of$$D$$that will let the company invest in fixing the product $\backslash$and market it$,$if the first level of technological failure occurs? for the teacher D is around $1691,$ find it please