11.A single discount equivalent to two successive discounts of 12 1/2 % and 20 % is

12.Ravi purchased an article marked at Rs 21,000 at 5 % discount.The rate of sales tax on the article is 10%.Money paid by Ravi to purchase the article is 10 %.Money paid by Ravi to purchase the article is

13.A merchant purchases a wrist watch for Rs 450 and fixes its list price in such a way that after allowing a discount of 10%,he earns a profit of 20%.Find the list price of the wrist watch

14.Base of a right pyramid is a square .The length of a diagonal of the base is 12√2 cm.If each lateral surface of the pyramid is an equilateral triangle,then its volume(in cu.cm) is

15.The height of the cylinder,in cm is #Q The curved surface area of a right circular cylinder of radius 2 cm is 264 cm².The height of the cylinder,in cm is