A company blends two varieties of tea from two different tea gardens, one variety costing Rs. 20 per kg, and other Rs 25 per kg, in the ratio 5 : 4. He sells the blended tea at Rs. 23 per kg. Find his profit percent. (A) 4% (B) 3% (C) 3.5% (D) 4.5% (E) 5%