The difference between the selling prices of some articles if sold for Rs.12 per article instead of Rs.9 per article is Rs.150. If the sold price of these articles is Rs.250 then find the selling price of 21 articles if profit earned is 20%.

If sin²a = cos³a then the value of cot⁶ a – cot²a? 

In ΔABC, ∠C=90° and D is a point on CB such that AD is the bisector of ∠A. If AC=5 cm and BC=12 cm, then what is the length of AD?

On selling 17 balls at Rs. 720 there is a loss equal to the cost price of 5 balls. The cost price of a ball is: 

The area of an isosceles trapezium is 176 m2 and the height is 2/11 of the sum of its parallel sides. If the ratio of the length of the parallel sides is 4: 7. Then what is the measure of height of the isosceles trapezium-

A merchant loses 10% by selling an article. If the cost price of the article is ₹ 15, then the selling price of the article is 

The difference between the compound and the simple interest on a sum for 2 years at 10 % per annum , when the interest is compounded annually, is Rs.28. If the yearly interest were compounded half yearly, the difference in the two interests will be 

What will be the compound interest (compounded annually) of 3 years at the rate of 12.5 percent on an amount of Rs. 5120?