The average cost of 7 comics is $30.
After another comic that costs $70 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 30
= $210
New total cost of all the comics
= 210 + 70
= $280
(b)
New total number of comics
= 7 + 1
= 8
New average cost of all the comics
= 280 ÷ 8
= $35
Answer(s): (a) $280; (b) $35