By selling 144 hens, swarn lost the selling price of 6 hens. Find her lost percent.

15 chairs can be bought for Rs. 3532.50. How many chairs can be bought for Rs. 5416.50?

A vendor bought oranges at 20 for Rs.56 and sold them at Rs.35 per dozen. Find his gain or loss per cent?

Rajan purchased a purse at 25% discount on its marked price but sold it at the marked price. Find the gain percent of Rajan on this.

The question is - A grocer purchased 200kg of rice at Rs. 25 per kg. He sold 80kg of at a gain of 10% and 40kg at a loss of 4%. At what rate per kg should he sell the remainder to gain 8% on his total investment?