what we have to know is what fracion of 8 oz is 3 oz?
it's [tex] \frac{3}{8} [/tex].
now we multiply this by 1200:
[tex]1200* \frac{3}{8} [/tex].
i'll simplify by dividing by 2:
[tex]600* \frac{3}{4} [/tex].
[tex]300* \frac{3}{2} [/tex].
[tex]150* \frac{3}{1} [/tex].
which is 450. So, the answer is 450 calories!