The average cost of 3 novels is $50.
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 3 novels
= 3 x 50
= $150
New total cost of all the novels
= 150 + 70
= $220
(b)
New total number of novels
= 3 + 1
= 4
New average cost of all the novels
= 220 ÷ 4
= $55
Answer(s): (a) $220; (b) $55