The average cost of 6 story books is $40.
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 6 story books
= 6 x 40
= $240
New total cost of all the remaining story books
= 240 - 80
= $160
(b)
Number of remaining story books
= 6 - 1
= 5
New average cost of all the remaining story books
= 160 ÷ 5
= $32
Answer(s): (a) $160; (b) $32