The average cost of 8 books is $70.
After 2 books are removed,
the average cost of the remaining books is $60.
- 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 70
= $560
Number of remaining books
= 8 - 2
= 6
Total cost of the remaining books
= 6 x 60
= $360
Total cost of the 2 books that are removed
= 560 - 360
= $200
(b)
Average cost of the 2 books that are removed
= 200 ÷ 2
= $100
Answer(s): (a) $200; (b) $100