Question

George plans to purchase a new scooter for $8000 and to keep it until it is worth a fourth of it's original price. The value of the scooter is give by V = 8000(
1
8
)t, where V is the value of the scooter and t is the number of years that have passed.

If George finds that he can buy the scooter on sale for $6895, how should he change the value equation? give me answer for this pls