The average cost of 6 manuals is $20.
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 6 manuals
= 6 x 20
= $120
New total cost of all the manuals
= 120 + 90
= $210
(b)
New total number of manuals
= 6 + 1
= 7
New average cost of all the manuals
= 210 ÷ 7
= $30
Answer(s): (a) $210; (b) $30