Question 938288
Logarithm skills are necessary.  Understanding exponential functions must be assumed.


Pick your base, preferably e or 10.


{{{log(10,17)=log(10,(13*1.03^t))}}}


{{{log(10,17)=log(10,13)+log(10,(1.03^t))}}}


{{{log(10,17)-log(10,13)=log(10,(1.03^t))}}}


{{{t*log(10,1.03)=log(10,17)-log(10,13)}}}


{{{highlight(t=(log(10,17)-log(10,13))/log(1.03))}}}

which can also be shown as

{{{highlight(t=log(10,(17/13))/log(10,1.03))}}}


Use either a calculator or a table of logarithms to finish computing.