Question : A man bought 13 chairs at INR 150 each and 15 chairs at INR 130 each. The average price of a chair (to the nearest rupee) is:
Option 1: INR 130
Option 2: INR 145
Option 3: INR 142
Option 4: INR 139
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Correct Answer: INR 139
Solution :
The number of chairs of cost INR 150 bought = 13
The number of chairs of cost INR 130 bought = 15
Now, the Average price of a chair
= $\frac{\text{Total price of all chairs}}{\text{Total number of chairs}}$
= $\frac{13 × 150+ 15×130}{13+15}$
= $\frac{3900}{28}$
= $139.28\approx 139$
Hence, the correct answer is INR 139.
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