Question
The average cost of 5 non-fiction books is $40.
After a non-fiction book that costs $80 is removed,
  1. What is new total cost of all the remaining non-fiction books?
  2. What is new average cost of all the remaining non-fiction books?
3 m
(a)

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(b)

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The average cost of 5 non-fiction books is $40.
After a non-fiction book that costs $80 is removed,
  1. What is new total cost of all the remaining non-fiction books?
  2. What is new average cost of all the remaining non-fiction books?