The cost of 8 dozen pencil and 2 dozen note book is 520 rupee. If cost of 3 pencil and 4 note book is 60 rupee, then sum of the cost of 1 pencil and 1 note book will be (in rupee)  Choose the most appropriate option
A) rs 13.51 B) rs 15.51 C) rs 16.51 D) rs 14.51 E) rs 17.51
let cost of pencil=rs x   cost of notebook= rs y   cost of 8 dozen pencils are 96x   cost of 2 dozen pencils are 24y   cost of 3 pencils are 3x   cost of 4 notebooks are 4y   equations are   96x + 24y = 520-----1   3x +4y = 60-----2   multiplying 6 with equation (2) and then subtracting eqn (1)-eqn (2),we get   96x + 24y = 520   18x + 24y = 360   after solving the equations,we get   x=2.05   y=13.46   cost of 1 pencil and 1 notebook is  2.05+13.46= 
<gadget id="calculator"> 2.05+13.46</gadget>
<output>15.51</output>
rs 15.51   ANSWER:rs 15.51
<result>B</result>
The cost of 8 dozen pencil and 2 dozen note book is 520 rupee. If cost of 3 pencil and 4 note book is 60 rupee, then sum of the cost of 1 pencil and 1 note book will be (in rupee)