1490 thousand help me get that number because I can't find them

Ineed ! the person who answers and shows their work on they got the answer first will be marked the !

Asocial networking site currently has 400,000 active members, and that figure is predicted to increase by 32% each year. the following expression represents the number of active members on the site after t years.

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?