The average cost of 7 manuals is $50.
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 7 manuals
= 7 x 50
= $350
New total cost of all the manuals
= 350 + 90
= $440
(b)
New total number of manuals
= 7 + 1
= 8
New average cost of all the manuals
= 440 ÷ 8
= $55
Answer(s): (a) $440; (b) $55