Answer:
the account balance be in 12 years is $912.12
Explanation:
Geoff has deposited $669 in a savings account that earns interest at a rate of 2.6% compounded twice a year.

A is the balance amount
P is the Initial amount = 669
R= rate of interest 2.6%= 0.026
n is the number of times compounded=2
t is the number of years= 12
Plug in all the values and find out A


A= 912.12
the account balance be in 12 years is $912.12