The average cost of 5 manuals is $60.
After another manual that costs $90 is added,
- What is new total cost of all the manuals?
- What is new average cost of all the manuals?
(a)
Total cost of 5 manuals
= 5 x 60
= $300
New total cost of all the manuals
= 300 + 90
= $390
(b)
New total number of manuals
= 5 + 1
= 6
New average cost of all the manuals
= 390 ÷ 6
= $65
Answer(s): (a) $390; (b) $65