No . because you would then have 2/4 which is 1/2 50%
You should purchase from the store that is selling the 2/$5. You spend less money per item. The A store has you pay $2.50 per item with the deal while the B store has you pay almost $6 per item.
.005 inches is the answer. you just divide 3/4 inches by 150
Vertex is

and minimum value of f(x) is 12
Hope this helps