The average cost of 5 non-fiction books is $40.
After a non-fiction book that costs $80 is removed,
- What is new total cost of all the remaining non-fiction books?
- What is new average cost of all the remaining non-fiction books?
(a)
Total cost of 5 non-fiction books
= 5 x 40
= $200
New total cost of all the remaining non-fiction books
= 200 - 80
= $120
(b)
Number of remaining non-fiction books
= 5 - 1
= 4
New average cost of all the remaining non-fiction books
= 120 ÷ 4
= $30
Answer(s): (a) $120; (b) $30