The average cost of 3 magazines is $30.
After another magazine that costs $90 is added,
- What is new total cost of all the magazines?
- What is new average cost of all the magazines?
(a)
Total cost of 3 magazines
= 3 x 30
= $90
New total cost of all the magazines
= 90 + 90
= $180
(b)
New total number of magazines
= 3 + 1
= 4
New average cost of all the magazines
= 180 ÷ 4
= $45
Answer(s): (a) $180; (b) $45