The average cost of 3 novels is $20.
After another novel that costs $80 is added,
- What is new total cost of all the novels?
- What is new average cost of all the novels?
(a)
Total cost of 3 novels
= 3 x 20
= $60
New total cost of all the novels
= 60 + 80
= $140
(b)
New total number of novels
= 3 + 1
= 4
New average cost of all the novels
= 140 ÷ 4
= $35
Answer(s): (a) $140; (b) $35