Question 1127821
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The question asks for the "discount rate", but the problem condition has no any info to determine it; 
the condition ever does not mention this term  "the discount rate".


So, I conclude that the question is not relevant to the given part,  and,  reversely,

the given part is not relevant to the question.



Shortly saying,  the problem,  as it is posted,  presented and worded,  is  DEFECTIVE.



Next time be more attentive,  please.



Have a nice day / evening / night / morning.