Don't lie about your age and 32oz+(2*128)=32oz+256=288oz
The account will be worth $2368.20 in 7 years.
The compound interest formula is

where p is the principal invested, r is the interest rate as a decimal number, n is the number of times the interest is compounded yearly, and t is the amount of time.
3.35% = 3.35/100 = 0.0335.
Using our information, we have:

which comes out to $2368.20.
I would guess that 4.25 pounds is another way to say 4 1/4 pounds, but without being given the answer choices, I can only give you an educated guess.