A shopkeeper allows 20% off on the marked price of goods and still gets a profit of 25%. What is the actual cost to him of an article marked Rs. 500?

A shop selling sewing machines offers 3% discount on all cash purchases. What cash amount does a customer pay for a sewing machine the price of which is marked as Rs. 650.

Shikha’s income is 60% more than that of Shalu. What percent is Shalu’s income less than Shikha’s?

Amit borrowed Rs. 16000 at 17 1/2 % per annum simple interest. On the same day, he lent it to Ashu at the same rate but compounded annually. What does he gain at the end of 2 years?

What sum will amount to Rs. 4913 in 18 months, if the rate of interest is 12% per annum, compounded half-yearly?