The answer is 5 years because you have to use the simple interest formula which is I=Prt . P equals the balance you started with so 8,000. R equals the rate or interest rate which is 6% or 0.06. T equals the time and i just put in the option 5 years just to guess which one it was and i was right. I=8,000x0.06x5 and that equals 2400 and then you add 8,000 and that gives you 10,400