The average cost of 3 paperbacks is $50.
After another paperback that costs $90 is added,
- What is new total cost of all the paperbacks?
- What is new average cost of all the paperbacks?
(a)
Total cost of 3 paperbacks
= 3 x 50
= $150
New total cost of all the paperbacks
= 150 + 90
= $240
(b)
New total number of paperbacks
= 3 + 1
= 4
New average cost of all the paperbacks
= 240 ÷ 4
= $60
Answer(s): (a) $240; (b) $60