The average cost of 3 story books is $50.
After a story book that costs $80 is removed,
- What is new total cost of all the remaining story books?
- What is new average cost of all the remaining story books?
(a)
Total cost of 3 story books
= 3 x 50
= $150
New total cost of all the remaining story books
= 150 - 80
= $70
(b)
Number of remaining story books
= 3 - 1
= 2
New average cost of all the remaining story books
= 70 ÷ 2
= $35
Answer(s): (a) $70; (b) $35