Given that the total cost of 5 erasers, 7 sharpeners and 9 pencils is Rs. 100 and the total cost of 2 ersers, 6 sharpeners and 10 pencils is Rs. 80.What is the total cost (in Rs.) of one eraser, one sharpender and one pencil ?

Question

( A ) 15
( B ) 20
( C ) 10
( D ) Data are not sufficinet