Avg cost of 5 pens and 4 pencils isRs. 36.The avg cost of 5 pens and 9 pencils is Rs.56.Find the total cost of 25 pens and 25 pencils? Choose the correct choice from the following answers:
A) 80  B) 90  C) 100  D) 110  E) 120
Avg cost of 5 pens and 4 pencils is Rs. 36   (5 pen + 4 pencils) 9=36   therefore 1 pen cost is  36/9= 
<gadget id="calculator"> 36/9</gadget>
<output>4</output>
4, so 5 pen cost is 5x4=20 and 4 pencils cost is 4x4=16   Again, avg cost of 5 pens and 9 pencils is Rs.56   (5 pen + 9 pencils) 14=56   therefore 1 pen cost is  56/14= 
<gadget id="calculator"> 56/14</gadget>
<output>4</output>
4, so 5 pen cost is 5x4=20 and 9 pencils cost is 9x4=36   So 25 pen cost is (25/a)=100 and 25 pencils cost is (25x4)=100   ANSWER:100
<result>C</result>
Avg cost of 5 pens and 4 pencils isRs. 36.The avg cost of 5 pens and 9 pencils is Rs.56.Find the total cost of 25 pens and 25 pencils?