The average cost of 4 novels is $40.
After another novel that costs $70 is added,
- What is new total cost of all the novels?
- What is new average cost of all the novels?
(a)
Total cost of 4 novels
= 4 x 40
= $160
New total cost of all the novels
= 160 + 70
= $230
(b)
New total number of novels
= 4 + 1
= 5
New average cost of all the novels
= 230 ÷ 5
= $46
Answer(s): (a) $230; (b) $46