A machine is marked at Rs. 6800 and available at a discount of 10%. The shopkeeper gives another off season discount to the buyer and sells the machine for Rs. 5202. Find the off season discount ?

Marked price of machine = Rs. 6800
After 1st discount
$$\eqalign{ & = \frac{{90}}{{100}} \times 6800 \cr & = {\text{Rs}}{\text{. 6120}} \cr} $$
Selling price of machine = Rs. 5202
$$\eqalign{ & {\text{Discount }}\% \cr & = \frac{{6120 - 5202}}{{6120}} \times 100 \cr & = \frac{{918}}{{6120}} \times 100 \cr & = 15\% \cr} $$