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