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A person buys some pen and pencil from the market at a rate such that a pencil is twice as costly as pen. He sells them such that the cost of pencil is thrice the cost of pen. By selling a pen at twice of its cost price, he makes 150 % profit on the whole. Find the ratio of pencils to pen.

A)  1 : 2        

B)  4 : 5         

C)  3 : 4       

D)  7 : 4

E)             None of these