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Pencils are packed in packets containing 20 pencils each. The packets are placed in cartons each containing two dozens packets. A bookshop owner bought 5 cartons of pencils and sold each pencil at sh 3. How much money was obtained from the sale of all the pencils?
A. Sh 7 200
B. Sh 2 400
C. Sh 1 440
D. Sh 3 600