A shopkeeper bought 20 kg of rice at Rs. 55 per kg, 25 kg of rice at Rs. 50 per kg, and 35 kg of rice at Rs. 60 per kg. He spent a sum of Rs. 150 on transportation. He mixed all the three types of rice and sold all the stock at Rs. 62.56 per kg. His profit percent in the entire transaction is:

Rs. 55 per kg → 20 kg Rice
Rs. 50 per kg → 25 kg Rice
Rs. 60 per kg → 35 kg Rice
55 × 20 = Rs. 1100
50 × 25 = Rs. 1250
60 × 35 = $$\underline {\,{\text{Rs}}{\text{. 2100}}\,} $$
             = Rs. 4450 + Rs. 150
Total Rice 80 kg → Rs. 4600
1 kg → Rs. 57.50
62.56
57.50
$$\overline {\,\,\,5.06\,} $$
$$\frac{{5.06}}{{57.5}}$$  × 100 = 8.8%