What will be the cost price of 1 pen?
The selling price of 15 pens is equal to the cost price of 12 pens. what is the loss percentage?
The total cost of 12 pens and 3 pencils is equal to Rs. 100. Also, the cost of 1 pencil is Rs. 6 less than the cost of 1 pen. What will be the cost of 8 pens and 9 pencils?