The average cost of 5 paperbacks is $20.
After another paperback that costs $80 is added,
- What is new total cost of all the paperbacks?
- What is new average cost of all the paperbacks?
(a)
Total cost of 5 paperbacks
= 5 x 20
= $100
New total cost of all the paperbacks
= 100 + 80
= $180
(b)
New total number of paperbacks
= 5 + 1
= 6
New average cost of all the paperbacks
= 180 ÷ 6
= $30
Answer(s): (a) $180; (b) $30