The average cost of 6 non-fiction books is $30.
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 6 non-fiction books
= 6 x 30
= $180
New total cost of all the remaining non-fiction books
= 180 - 80
= $100
(b)
Number of remaining non-fiction books
= 6 - 1
= 5
New average cost of all the remaining non-fiction books
= 100 ÷ 5
= $20
Answer(s): (a) $100; (b) $20