250(1.03)^n=400
solve for n
1.03^n = 400/250 = 1.6
n log1.03 = log1.6
(Any log base can be used, as long as is it the same for both logs.)
n = 15.90
solve for n
n log1.03 = log1.6
(Any log base can be used, as long as is it the same for both logs.)
n = 15.90