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Step-by-step explanation:
It is not right for the sales manager of any company to anticipate the prospective candidate for promotion, until completion of the financial year. This is because, any employee can outperform other at any point in any business deal. Therefore, every employee should be subjected to performance scrutiny till the last day of the financial year. Judgement, at the beginning or mid of the year might not be a right.
14560=13000(1+r)^4/12
Now can you solve for r?