As per question,
Market price of the skirt =Rs.1200
During normal season discount @25 %=25100×1200=Rs. 300
After the discount, price of the skirt 1200−300
Rs. 900
In off season, the shopkeeper also offer discount @30 %=30100×900=Rs. 270
Now, the price of skirt after 30% discount,=900−270=Rs. 630