Answer :
Smart shoppers buy items that they need in bulk amounts. In this case, a shopper saves time and effort in buying future stocks of the same items that are needed. In 2, the answer is B. In 3, we add 4.05 and 3.99 that is equal to 8. 04. Answer in 3 is c.
The actual answer for this is:
1.B) at their lowest cost
2.B) line up the decimals of the numbers then add from right-to-left
3.C) $8.04
4.B) $879.21