Question 1127459
you say "annual rate" and not "compounded annually" so I will assume you mean simple interest. If you need compound interest send me an email.
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I = Interest
P = Principal (the initial investment)
r = rate of interest
t = time
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I = Prt
900 = P(0.03 * 5)
900 = P(0.15)
P(0.15) = 900
P = 900/0.15 = 6,000 was the initial investment