The average cost of 3 story books is $50.
After a story book that costs $60 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 - 60
= $90
(b)
Number of remaining story books
= 3 - 1
= 2
New average cost of all the remaining story books
= 90 ÷ 2
= $45
Answer(s): (a) $90; (b) $45