A sum of money becomes eight times of itself in 3 years at compound interest. The rate of interest per annum is 

Manju's salary is 60% more than Sohan's then tell what % Sohan's salary is less than Manju's salary?

What is the simplification value of $${cotA+tanB}\over{cotB+tanA}$$?

If $$ {x+{1\over x}}=2$$ then find out the value of $${2x^2+2}\over{3x^2+5x+3}$$

What is compound interest on a sum of Rs. 37,500 for $$ {1{1\over 3}}$$ years at a rate of 12 % per year. If the interest is compounded 8 monthly?

On adding a natural number P to the product of four consecutive natural numbers we get a perfect square number. The minimum value of P is:

An article is sold at a gain of 16%. If it had been sold for Rs.400 more, 20% would have been gained. The cost price of the article is

A gun is fired at a distance of 1.7 km from Ram and he hears the sound after 25 seconds. The speed of sound in meter per second is