Correct Answer - Option 3 : Rs.4,200
Given:
Cost of 5 tables and 9 chairs = Rs. 15400
Selling price of tables = 10% profit
Selling price of chairs = 20% profit
Total profit on selling all the tables and chairs = Rs. 2080
Calculation:
Let the CP of one table and one chair be x and y respectively
5x + 9y = 15400 ...(1)
According to the question
5x × (10/100) + 9y × (20/100) = 2080
⇒ 5x/10 + 18y/10 = 2080
⇒ 5x + 18y = 20800 ...(2)
Subtracting equation (1) from equation (2)
9y = 5400
⇒ y = 600
Cost of 7 chairs = 7 × 600
⇒ Rs. 4200
∴ The cost of 7 chairs is Rs. 4200