If in 1997 , 1998 and 1999 a worker received 10% more in salary each year than he did the previous year, how much did he receive in 1999 than in 1997 ?

What was the rate of profit margin ( in % ) if a motor bike which cost tk. 50,000 was sold for tk. 52,000 ?

What annual rate was paid if tk. 50,000 earned tk. 3,000 in interest in two years ?

How much interest will tk. 10,000 earn in 9 months at an annual rate of 6% ?

In a group of 60 probationary officers, 40% of them were promoted, 12 of them were terminated and rest to them...

What is the rate of discount if a car which cost tk. 3,00,000 is sold for tk. 2,79,000 ?

When an article is sold for tk. 250, the seller makes 25% profit. What is the cost of the article ?