The average cost of 3 guide books is $70.
After a guide book that costs $80 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 70
= $210
New total cost of all the remaining guide books
= 210 - 80
= $130
(b)
Number of remaining guide books
= 3 - 1
= 2
New average cost of all the remaining guide books
= 130 ÷ 2
= $65
Answer(s): (a) $130; (b) $65