The average cost of 7 books is $90.
After 2 books are removed,
the average cost of the remaining books is $20.
- 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 7 books
= 7 x 90
= $630
Number of remaining books
= 7 - 2
= 5
Total cost of the remaining books
= 5 x 20
= $100
Total cost of the 2 books that are removed
= 630 - 100
= $530
(b)
Average cost of the 2 books that are removed
= 530 ÷ 2
= $265
Answer(s): (a) $530; (b) $265