The average cost of 4 paperbacks is $30.
After another paperback that costs $70 is added,
- What is new total cost of all the paperbacks?
- What is new average cost of all the paperbacks?
(a)
Total cost of 4 paperbacks
= 4 x 30
= $120
New total cost of all the paperbacks
= 120 + 70
= $190
(b)
New total number of paperbacks
= 4 + 1
= 5
New average cost of all the paperbacks
= 190 ÷ 5
= $38
Answer(s): (a) $190; (b) $38