Jed deposited 400 into a bank that offers 3.9 interest rate compounded daily In how many years will his balance be 800?

To find out how many years it will take for Jed's deposit to grow from $400 to $800 with a 3.9% interest rate compounded daily, we can use the formula for compound interest: ( A = P(1 + \frac{r}{n})^{nt} ). Here, ( A = 800 ), ( P = 400 ), ( r = 0.039 ), and ( n = 365 ). Solving for ( t ) gives approximately 18.5 years for the balance to double to $800.