Kenneth S. answered 04/13/17
Tutor
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Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018
I would assume that, if you've been assigned this problem, you are familiar with the Compounding Formula:
A(t) = P(1+r/n)nt
where P is the principal ($8,000), t is # of years, r is the annual rate of interest, expressed in decimal form (r=0.8 in your case), and n is # of times compounding per year (n=1 in your case).
So get busy on your calculator.