Elizabeth wants to buy 20 identical pencils as follows.
1 for $4.306 for $23.40 What is the least amount of money she needs to buy 20 such pencils?
Maximum number of sets that Elizabeth can buy
= 20 ÷ 6
= 3 r 2
Amount to pay for 3 sets of 6 pencils
= 3 x 23.40
= $70.20
Amount to pay for the remaining pencils not part of a set
= 2 x 4.30
= $8.60
Least amount that Elizabeth needed to pay
= 70.20 + 8.60
= $78.80
Answer(s): $78.80