# A trader has purchsed pens at the rate of Rs. 42 per dozen. If the profit earned is 14 2/7% what is the selling price?

CP of 12 pens = Rs. 42
CP of 1 pen = Rs. 3.50

profit % =

SP of a pen = Rs. 4.00

• -4

we cant solve it without knowing the no. of pens he bought

• -3
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