Final answer:
The cost of 1 kg of yam is ₹ 37.50. To find the cost of 1 kg of yam, subtract the cost of the onions from the total amount paid.
Step-by-step explanation:
To find the cost of 1 kg of yam, we first need to calculate the total cost of the onions and yam that Manju bought. Manju bought 2.5 kg of onion at ₹ 25 per kg, so the cost of the onions is 2.5 kg x ₹ 25/kg = ₹ 62.50. He also bought 0.5 kg of yam, and we need to find the cost of 1 kg of yam. Since Manju paid ₹ 100 in total, we can subtract the cost of the onions from the total to find the cost of the yam.
Total cost - Cost of onions = Cost of yam
₹ 100 - ₹ 62.50 = ₹ 37.50
Therefore, the cost of 1 kg of yam is ₹ 37.50.