Andrew M. answered 01/08/18
Tutor
New to Wyzant
Mathematics - Algebra a Specialty / F.I.T. Grad - B.S. w/Honors
To answer this we need to know the interest rate and how often it is compounded.
For example: 3% interest compounded semiannually (2 times per year)
A = p(1+r/n)nt
A = final amount
p = principal = 100
r = interest rate = 3% = 3/100 = 0.03
n = # times compounded per year = 2
t = time in years = 45
A = 100(1+0.03/2)2(45)
A = 100(1.015)90
A = $381.89
This is just an example to show you how the problem is done.