20 dual desks and 12 chairs were bought for ₹79,600. If the average cost of a dual desk was ₹3,500, find the average cost of a chair.​

Correct option is D

Given:

The total cost of 20 dual desks and 12 chairs is ₹79,600.

The average cost of a dual desk is ₹3,500.

We need to find the average cost of a chair.

Formula Used:

Total cost of dual desks = (Number of dual desks) × (Average cost of a dual desk)

Solution: ​

Total cost of dual desks = 20 × 3500 = 70,000

Total cost of chairs = 79,600 − 70,000 = 9,600

Average cost of a chair = $$\frac{9,600}{12}$$​ = 800

Thus, the average cost of a chair is ₹800