Question : The average price of 20 pens is Rs. 18. If 12 new pens are added, then the average price rises by Rs. 4. What is the total price of the new pens?
Option 1: Rs. 384
Option 2: Rs. 368
Option 3: Rs. 328
Option 4: Rs. 344
Correct Answer: Rs. 344
Solution :
Given: The average price of 20 pens = Rs. 18
Total price of 20 pens = 20 × 18 = 360
If 12 new pens are added, then the average price rises by Rs. 4 = 32 × 22 = 704
The total price of the new pens = 704 – 360 = 344
Hence, the correct answer is Rs. 344.
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