Simple interest on a certain sum is equal to the sum itself. find the time if rate of interest and time are numerically equal.

What will be the compound interest on a sum of Rs. 21000 for 2 years at the rate of 14.28% per annum when interest is compound yearly?

If A : B = 3 : 2, then (3A – 2B): (2A – B) is equal to

A travels 20 km with a speed of 40 km/hr. He travels another 45 km with a speed of 15 km/hr. what is his average speed for the entire journey?

A bus can travel $$ 12{2\over5}$$ Km in one hour. How much distance will it cover in $$ 2{3\over4}$$ hours? 

Jack sold a dress for Rs.1440 and made a profit of 20%. What was its cost? 

Fill in the blanks:
Sin A = ____ × (Cos A) 

A trader bought 120 kg of potato at 24/kg. He sold 80 kg of it at 50% profit and the balance at 25% low. Find the total profit or loss?