Book Maths Puzzle

the cost of 1 pencil,2 pens,4 eraser is Rs22 while cost of 5 pencils,4 pens,2 eraser is Rs32.How much will 3 pencils,3 pens,3 erasers cost?

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Book Other Question

A work has been done by 2 persons in 24min.one of them can do this work a lonely in 40min.how much time required to do the same work for the 2nd person? A shopkeeper bought a watch for Rs 400 and sold it for Rs 500.
What is his profit %?