Answer:
If you buy a diaper online instead of Babies-R-us, you save 4 cents more.
Explanation:
If 56 diapers cost 28
then 1 diaper cost x
56x = 28
x = 28/56
x = 0.5 or 50 cents
If 112 diapers cost 52
then 1 diaper cost x
112x = 52
x = 52/112
x = approximately 46 cents.