The average cost of 5 paperbacks is $50.
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 50
= $250
New total cost of all the paperbacks
= 250 + 80
= $330
(b)
New total number of paperbacks
= 5 + 1
= 6
New average cost of all the paperbacks
= 330 ÷ 6
= $55
Answer(s): (a) $330; (b) $55