The average cost of 7 comics is $40.
After another comic that costs $80 is added,
- What is new total cost of all the comics?
- What is new average cost of all the comics?
(a)
Total cost of 7 comics
= 7 x 40
= $280
New total cost of all the comics
= 280 + 80
= $360
(b)
New total number of comics
= 7 + 1
= 8
New average cost of all the comics
= 360 ÷ 8
= $45
Answer(s): (a) $360; (b) $45