The average cost of 3 non-fiction books is $40.
After a non-fiction book that costs $70 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 3 non-fiction books
= 3 x 40
= $120
New total cost of all the remaining non-fiction books
= 120 - 70
= $50
(b)
Number of remaining non-fiction books
= 3 - 1
= 2
New average cost of all the remaining non-fiction books
= 50 ÷ 2
= $25
Answer(s): (a) $50; (b) $25