Sangram bought 30 kg of wheat at the rate of Rs 9.50/kg of wheat and the same quantity of wheat at the rate of Rs 8.50/kg and mixed them. He sold the mixture at the rate of Rs 8.90/kg. Find his total profit or loss in the whole transaction?

Sangram bought 30 kg at Rs 9.50/kg and 30 kg at Rs 8.50/kg, so total quantity = 60 kg. Total cost = (30 × 9.50) + (30 × 8.50) = 285 + 255 = Rs 540. Average cost per kg = 540/60 = Rs 9/kg. He sold at Rs 8.90/kg, so selling price = 60 × 8.90 = Rs 534. Loss = Cost - Selling price = 540 - 534 = Rs 6. This matches option B. The question asks for profit or loss, and since it's a loss, the answer is 6.