The cost of Type 1 rice is Rs. 15 per kg and Type 2 rice is Rs. 20 per kg

The cost of Type 1 rice is Rs. 15 per kg and Type 2 rice is Rs. 20 per kg. If both Type 1 and Type 2 are mixed in the ratio of 2 : 3, then the price per kg of the mixed variety of rice is

  1. Rs. 19
  2. Rs. 19.50
  3. Rs. 18
  4. Rs. 18.50

Answer

Use concept of weighted average.

2 kg of Type 1 rice at Rs.15 is mixed with 3 kg of Type 2 rice at Rs.20. Total rice mixed is 5 kg.

Average price = (15*2 + 20*3)/5 = 18

The correct option is C.