The answer is 345 because you have to round
So we know that there are 16 ounces in one pound, so let's multiply to find how many cents one pound of jelly beans cost:

And we know that there are 100 cents in one dollar, so let's divide this by 100:

So the jelly beans cost $1.28 per pound.
-36/-31.5 = 1.1428571428571428571428571428571
-31.5/-27 = 1.1666666666666666666666666666667
-27/-22.5 = 1.2
-22.5/-18 = 1.25