Question 960524
50 - 21 = 29 years, so t = 29


"4.5% interest compounded semiannually" so r = 0.045 and n = 2



"your bank account balance is $15,000" ----> P = 15000


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A = P*(1+r/n)^(n*t)


A = 15000*(1+0.045/2)^(2*29)


A = 54,520.976597888


A = 54,521


So the answer is choice B


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