The average cost of 6 non-fiction books is $50.
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 6 non-fiction books
= 6 x 50
= $300
New total cost of all the remaining non-fiction books
= 300 - 70
= $230
(b)
Number of remaining non-fiction books
= 6 - 1
= 5
New average cost of all the remaining non-fiction books
= 230 ÷ 5
= $46
Answer(s): (a) $230; (b) $46