Michael A. answered 04/26/17
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From Algebra & Analogies to TSI & TEAS, I'll Make Them All a Breeze!
The formula for simple interest is I = Prt, where I = the amount of interest earned, P = the principal (amount of original investment), r = the interest rate, and t = time. In the problem, P = $3200, t = 9 months = 9/12 = 3/4 year, and r = 5% = 0.05. You have all the necessary information to solve the above equation for I, the amount of simple interest. Once you compute that, you can add it to the Principal ($3200) in order to determine the total amount at the end of the term.