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Online ProgramThe function \(f(x)=2\left(1.15\right)^{x} \)models the balance of an account in which $200 is deposited into an account that pays 15% interest per year, compounded annually. Its graph is shown below. The owner of the account wants to withdraw the money after the account balance triples. What part of the domain of this function is used to model the time the customer must leave the money in the account? Enter your answer using brackets [ ].