The price of 10 chairs is equal to that of 4 tables. The price of 15 chairs and 2 tables together is Rs. 4000. The total price of 12 chairs and 3 tables is:  Select the correct option:
A) Rs. 3500
B) Rs. 3750
C) Rs. 3840
D) Rs. 3900
E) Rs. 4900
Let the cost of chairs be 'x' and tables be 'y'.   10x=4y i.e., x=(2/5)y   and given that 15x+2y=4000   15((2/5)y)+2y=4000   8y=4000 i.e., y=500 and x=200   The total price of 12 chairs and 3 tables is: 12*(200)+3*500=2400+1500= 
<gadget id="calculator">2400+1500</gadget>
<output>3_900</output>
3900   ANSWER:Rs. 3900
<result>D</result>
The price of 10 chairs is equal to that of 4 tables. The price of 15 chairs and 2 tables together is Rs. 4000. The total price of 12 chairs and 3 tables is: