A shopkeeper bought 15 kg of rice at the rate of Rs.29/kg and 25kg of rice at the rate of Rs.20/kg. He sold the mixture of both types of rice at the rate of Rs.27/kg. His profit (in Rs) was,
145
Total cost price of 15 + 25 = 40 kg of rice = 15 × 29 + 25 × 20 = 435 + 500 = 935
The total sale price of this 40 kgs of mixed rice,
40×27=1080
Profit on Rs.935 was,
1080−935 = Rs.145.