Assuming the inteest is annual, since it's simple that means we just have to analyze:
[tex] A=P(1+r)^t [/tex], where r is our interest rate as a decimal, t is time, p is our principal investment and A is our ending value. So, in the context of our problem this becomes:
[tex] A=6000(1.05)^5 [/tex], which when evaluated by our trusty calculator becomes:
7657.68938,
which is rounded to 7500 in the problem.