The average cost of 5 books is $80.
After 2 books are removed,
the average cost of the remaining books is $40.
- 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 80
= $400
Number of remaining books
= 5 - 2
= 3
Total cost of the remaining books
= 3 x 40
= $120
Total cost of the 2 books that are removed
= 400 - 120
= $280
(b)
Average cost of the 2 books that are removed
= 280 ÷ 2
= $140
Answer(s): (a) $280; (b) $140