Im not at home to check it out but,

"convert(<4,3,2>,`*`)"

should work. 

Greetings,

The Function

rsolve({b(n + 1) = b(n) + 7.75/100*b(n) - 908.97, b(0)=4000}, b(n)):
b := unapply(evalf(%), n);

b(30)=470415.2588

So after 30 years of saving, you will have : $470415.2588, with 7.75%, and $4000 dollar each year, starting off with $4000. 


 

Download example_saving_account_at_7.75%.mw