The average cost of 5 colouring books is $60.
After a colouring book that costs $80 is removed,
- What is new total cost of all the remaining colouring books?
- What is new average cost of all the remaining colouring books?
(a)
Total cost of 5 colouring books
= 5 x 60
= $300
New total cost of all the remaining colouring books
= 300 - 80
= $220
(b)
Number of remaining colouring books
= 5 - 1
= 4
New average cost of all the remaining colouring books
= 220 ÷ 4
= $55
Answer(s): (a) $220; (b) $55