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A general formula for a simple interest account earning r percents per year is
FV = A*(1 + r*t)
where A is the original deposit, FV is the future value, r is the annual rate expressed as a decimal, t is the time (in years).
In our case, A = 5600 euro; r = 0.09; t = 6 years.
The future value of the account after 6 years is
5600 + 0.09*5600*6 = 8624 euro. ANSWER
Solved.