On selling of 18 pens at Rs.360, there is a loss equal to the cost of 3 pens. What is the cost price of a pen?

Rs. 10 Rs. 12 Rs. 24 Rs. 20

Rs. 24

According to the question , Cost price of the pen = \(\frac{Total \; SP}{Selling \; quantity - Loss}\) Cost price of the pen = \(\frac{360}{18-3}\) =  \(\frac{360}{15}\) = 24