The average cost of 4 dictionaries is $60.
After another dictionary that costs $70 is added,
- What is new total cost of all the dictionaries?
- What is new average cost of all the dictionaries?
(a)
Total cost of 4 dictionaries
= 4 x 60
= $240
New total cost of all the dictionaries
= 240 + 70
= $310
(b)
New total number of dictionaries
= 4 + 1
= 5
New average cost of all the dictionaries
= 310 ÷ 5
= $62
Answer(s): (a) $310; (b) $62