A shopkeeper marks the price of an article at Rs. 80. Find the cost price if after allowing a discount of 10% he still gains 20% of the cost price.
Rs.53.33
Rs.70
Rs.75
Rs.60
$\begin{aligned} & \text { M.P }=80 \\ & \text { C.P }=80 * 90 / 100 * 100 / 120=60\end{aligned}$