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? Share with your friends Share 0 Varun.Rawat answered this CP of 12 pens = Rs. 42 CP of 1 pen = Rs. 3.50 profit % = 1007 % profit % = profitCP ×100%⇒1007 = profit7/2×100⇒Profit = Re. 0.50 Profit = SP - CP ⇒ SP = 0.50 + 3.50 = Rs.4.00 SP of a pen = Rs. 4.00 -6 View Full Answer Nihal Undefined answered this we cant solve it without knowing the no. of pens he bought -3