At what rate percent per annum will the simple interest on a sum money be 2/5 of the amount in 10 years?

Even after reducing the marked price of a transistor by Rs. 32, a shopkeeper makes a profit of 15%. If the cost price be Rs. 320, what percentage of profit would he have made if he had sold the transistor at the marked price?

The current birth rate per thousand is 32, whereas corresponding death rate is 11 per thousand. The net growth rate in terms of population increase in percent is given by:

If A’s salary is 25% higher than B’s salary, how much per cent is B’s salary lower than A’s

A person takes a loan of Rs. 200 at 5% simple interest. He returns Rs. 100 at the end of 1 year. In order to clear his dues at the end of 2 years, he would pay:

The cost price of 19 articles is equal to the selling price of 16 articles. Gain percent is:

A person can save only 8% of his income . Five years hence his income is increased by 20% and he still saves the same amount find the increase % in his expenditure.

The banker's discount on Rs. 1600 at 15% per annum is the same as true discount on Rs. 1680 for the same time and at the same rate. What is the time?

IN how many years, Rs. 150 will produce the same interest @ 8% as Rs. 800 produce in 3 years@ 4(1/2)%?