At 12% discount, the selling price of a pen is Rs. 13.20. Find its marked price. Also, find the new selling price of the pen, if it is sold at 5% discount.
Let marked price = Rs. 100x
Discount = 12%
According to statement,
88x = 13.20
∴ Marked price 100x=100×320=Rs.15
New S.P. = 15×95100 [∵ discount = 5%]
= 15×1920=3×194=574 = Rs. 14.25