If the cost of 3 pen is rs 20.how will be the cost of 12 dozen pen.
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answer of this questi9n will be rs 20
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if cost of 3 pen = 20 then cost of one pen = 6.6666..
12dozen pens = 144 pens
144×6.6666..=960
12dozen pens = 144 pens
144×6.6666..=960
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