A tradesman marks his goods at 20 % above the cost price. He allows his customers a discount of 8% on marked price. Find out his profit percent.

What is single discount equivalent to two successive discounts of 15% and 20%?

From an observation tower ‘h’ meter above the level of river, the angle of depression of a point on the near shore is A^° and that of a point directly on the far shore is B^°. Find the width of the river.

The number, whose square is equal to the difference between the squares of 975 and 585, is: 

∆ ABC  is right angle at B. If m∠C = 45⁰ Then find the value of ( cosec A - √3) = ?

The simple interest on a certain sum of money at the rate of 5 % per annum for 8 years is ₹ 840. Rate of interest for which the same amount of interest can be received on the same sum after 5 years is? 

A man has 60 pens. He sells some of these at a profit of 12 % and the rest at 8 % loss. On the whole, he gets a profit 11 %. How many pens were sold at 12 % profit.

A person invested a sum of Rs. 18,600 at x% per year and another sum that is twice the former at (x+2)% per year, both at simple interest. If the total interest earned on both investments for $$ {3{1\over 2}}$$ years is Rs.23,110.50, then the rate of  interest per year on the second investment is: