Given, A person buys 10 articles at rate of Rs. 5 each and 30 articles at the Rate of Rs. 10 each. Total price of 10 Article = 10 × 5 = 50 And 30 articles at the Rate of Rs. 10 each. Total price of 30 Article = 30 × 10 = 300 Average = 50 + 300/ 10 + 30 = 350/ 40 = 35/ 4 = 8.75 Hence, “8.75” is the correct answer.