Book Maths Puzzle

A shopkeeper bought a watch for Rs 400 and sold it for Rs 500.
What is his profit %?

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Book Other Question

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? In SI,What sum amounts of Rs 1120 in 4yrs and Rs 1200 in 5 yrs?