Question
A man purchases some pens at a rate of 4 for ₹14 and
an equal number at a rate of 5 for ₹18. He sells all the pens at a rate of 6 for ₹20. What is his overall percentage gain or loss?Solution
Let he buys total number of pens (LCM of 4, 5, 6) = 60 (30-30 of both type) Costing of 30 pens at 4 for Rs 1 4 = Rs 105 Costing of 30 pens at 5 for Rs 18 = Rs 108 Total cost price of 60 pens = 105+108 = Rs 213 Selling price of 60 pens at 6 for Rs 20 = 200 
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