Products pass successively through the hands of three traders and each of them sells his goods at a profit of 30% of his cost price. If the last trader sold the products for Rs.300, then how much did the first trader pay for them? 

72 grams is what percent of 3.6 kilograms?

With the increase in the price of sugar by 45%, a consumer can buy 9 kg less sugar for Rs. 1740. What is the increased price per kg of sugar?

The number of students in a school increases and decreases by 10% respectively in every alternate year. If there was increase in the year 2000 then in how much percentage what happened in the number of students in the vear 2003 in comparison to year 2000.

If the purchase price of an article is equal to 80 percent of its selling price then there will be profit.

The value of a machine depreciates at the rate of 10% per annum. It was purchased 3 years ago. If its present value is Rs.53071.20, the purchase price of the machine was:

A student multiplies a number by 5/3 instead of 3/5. What is the percentage error in the calculation?

A basket contains 350 eggs. If 12% of the eggs are rotten, how many eggs are good enough to be sold?