The average cost of 6 non-fiction books is $70.
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 70
= $420
New total cost of all the remaining non-fiction books
= 420 - 80
= $340
(b)
Number of remaining non-fiction books
= 6 - 1
= 5
New average cost of all the remaining non-fiction books
= 340 ÷ 5
= $68
Answer(s): (a) $340; (b) $68