Hari bought 20 kg of rice at Rs 18 per kg and 25 kg of rice at Rs 16 per kg. He mixed the two varieties and sold the mixture at Rs 19 per kg. Find his gain percent in the whole transaction.
Arun purchased two varieties of wheat – 30 kg of wheat at the rate of Rs.11.50 per kg and 20 kg of wheat at the rate of Rs.14.25 per kg. Approximately what price per kg should he sell the mixture of the two varieties of wheat to make an overall profit of 30%?