I really need help

[Psychedelicfunk]

Suppose that $50,000 is invested at 7% interest, compounded annually. After time t, in years, it grows to the amount A given by the function A=$50,00(1.07)^t. Find the amount of time after which there will be $400,000 in the account.

 

[skeeter]

[MATH]400=50(1.07)^t[/MATH]
[MATH]8 = (1.07)^t[/MATH]
use logarithms to solve for t