A shopkeeper bought 30 kg of rice at the rate of Rs. 70

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A shopkeeper bought 30 kg of rice at the rate of Rs. 70 per kg and 20 kg of rice at the rate of Rs. 70.75 per kg. If he mixed the two brands of rice and sold the mixture at Rs. 80.50 per kg, his gain is

1. Rs. 450
2. Rs. 510
3. Rs. 525
4. Rs. 485

Correct Option: B

As per the given in question ,
C.P. of 50 kg of rice = Rs. (30 × 70 + 20 × 70.75)
C.P. of 50 kg of rice = Rs. (2100 + 1415) = Rs. 3515
S.P. of 50 kg. of rice = Rs. (50 × 80.50) = Rs. 4025
∴ Profit = S.P. of 50 kg. of rice - C.P. of 50 kg. of rice
Profit = Rs. (4025 – 3515) = Rs. 510