Sonu buys 40 kg of wheat at Rs.12.50 per kg and 30 kg of wheat at Rs.14 per kg. At what rate per kg should he sell the mixture to gain 5% on the whole?

A dealer gets 56 less if instead of selling a chair at a gain of 15%, it is sold at a gain of 8%. Find the cost price of the chair.

A cycle was sold at a gain of 10%. Had it been sold for Rs.260 more, the gain would have been 14%. Find the cost price of the cycle.

Wasim bought two cricket bats for Rs. 840 and Rs.360 respectively. He sells the first bat at a gain of 15% and the second one at a loss of 5%. Find his gain or loss per cent in the whole transaction.

Hema bought two pairs of jeans for Rs.1450 each. She sold one of them at a gain of 8% and the other at a loss of 4%. Find her gain or loss per cent in the whole transaction.