The average cost of 8 books is $90.
After 2 books are removed,
the average cost of the remaining books is $70.
- 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 8 books
= 8 x 90
= $720
Number of remaining books
= 8 - 2
= 6
Total cost of the remaining books
= 6 x 70
= $420
Total cost of the 2 books that are removed
= 720 - 420
= $300
(b)
Average cost of the 2 books that are removed
= 300 ÷ 2
= $150
Answer(s): (a) $300; (b) $150