Question

Which is the best unit price 12.95 for 3 pounds of candy or 21.45 or 5 pounds of candy

Answer 1

all you do is divide the price from the amount and you will get the price per one in your case...
12.95%3=4.31666666667 per candy
21.45%5=4.29 per candy
therefore the second option is better

Answer 2

12.95/3 = 4.32 per pound. . . . 21.45/5 = 4.29 per pound. . . . The first one is better, because too much candy is not good for you, and the slightly-higher price might convince you to buy less.