The average cost of 4 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 4 manuals
= 4 x 60
= $240
New total cost of all the manuals
= 240 + 90
= $330
(b)
New total number of manuals
= 4 + 1
= 5
New average cost of all the manuals
= 330 ÷ 5
= $66
Answer(s): (a) $330; (b) $66