Question
Mohit sold 5 pens making a 8% profit on each and another
15 pens making a 12% profit on each. If the total selling price for all 20 pens was ₹555, what was the cost price of one pen?Solution
Let the cost price of a pen = t
Selling price = ₹555
[(5 * 108/100) + (15 * 112/100)] of t = ₹555
(540 + 1680)t = 55500
2220t = 55500
t = ₹25
Hence, the cost price of a pen = ₹25
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