Question:
A shopkeeper bought 30 kg of rice at the rate of 7.00 per kg and 20 kg of rice at the rate of Rs. 7.75 per kg. He mixed the two and sold the mixture at the rate of Rs. 7.50 per kg. What was his gain/loss in the transaction?

Option A):
Rs. 27.50 loss
Option B):
Rs. 10.00 gain
Option C):
Rs. 22.50 gain
Option D):
Rs 10.00 loss

Correct Answer is Option B):
Rs. 10.00 gain