On selling a chair for Rs. 680, a man loses 15%. To gain 15%, it must be sold for

A man sells a bat for Rs. 100 gaining Rs. 20. His gain per cent is

The selling price of an article is of the cost price. The gain per cent is

A dealer lists his goods at 20% above cost price and allows a discount of 10%. His gain per cent is

The price of a watch including 8% VAT is Rs.810. What is its basic price?