The average cost of 5 books is $90.
After 2 books are removed,
the average cost of the remaining books is $80.
- What is the total cost of the 2 books that are removed?
- What is the average cost of the 2 books that are removed?
(a)
Total cost of 5 books
= 5 x 90
= $450
Number of remaining books
= 5 - 2
= 3
Total cost of the remaining books
= 3 x 80
= $240
Total cost of the 2 books that are removed
= 450 - 240
= $210
(b)
Average cost of the 2 books that are removed
= 210 ÷ 2
= $105
Answer(s): (a) $210; (b) $105