The owner of a furniture shop charges his customer 28% more than the cost price. If a customer paid Rs. 23680 for a dining table set, then what was the original price of the dining set ?

$$\eqalign{ & {\text{S}}{\text{.P}}{\text{.}} = {\text{Rs}}{\text{. }}23680 \cr & {\text{Profit}} = 28\% \cr & \therefore {\text{C}}{\text{.P}}{\text{.}} = {\text{Rs}}{\text{.}}\left( {\frac{{100}}{{128}} \times 23680} \right) \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = {\text{Rs}}{\text{. }}18500 \cr} $$