The average cost of 6 books is $50.
After 4 books are removed,
the average cost of the remaining books is $20.
- What is the total cost of the 4 books that are removed?
- What is the average cost of the 4 books that are removed?
(a)
Total cost of 6 books
= 6 x 50
= $300
Number of remaining books
= 6 - 4
= 2
Total cost of the remaining books
= 2 x 20
= $40
Total cost of the 4 books that are removed
= 300 - 40
= $260
(b)
Average cost of the 4 books that are removed
= 260 ÷ 4
= $65
Answer(s): (a) $260; (b) $65