The average cost of 3 guide books is $60.
After a guide book that costs $70 is removed,
- What is new total cost of all the remaining guide books?
- What is new average cost of all the remaining guide books?
(a)
Total cost of 3 guide books
= 3 x 60
= $180
New total cost of all the remaining guide books
= 180 - 70
= $110
(b)
Number of remaining guide books
= 3 - 1
= 2
New average cost of all the remaining guide books
= 110 ÷ 2
= $55
Answer(s): (a) $110; (b) $55