Question 1181742
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Accepting that the year is 365 days, the simple annual interest rate is  


    {{{(620-600)/(600*(75/365))}}} = {{{20/(600*(15/73))}}} = {{{1/(30*(15/73))}}} = {{{73/(30*15)}}} = {{{73/450}}} = 0.1622 = 16.22%  (rounded).    <A>ANSWER</U>
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Solved.