Explanation:

- To find the price of the mixture, use the weighted average method.

- Mix ratio is 7:20 for pulses X and Y.

- Price for X: Rs 100/kg.

- Price for Y: Rs 150/kg.

Calculate the total weight for averaging purposes:

- Total parts = 7 + 20 = 27

Calculate the weighted price:

- Contribution from X = (7/27) * 100

- Contribution from Y = (20/27) * 150

Sum these contributions:

- Price = (7/27) * 100 + (20/27) * 150

- Price = 25.93 + 111.11 = 137.04

Round to nearest Rupee:

- Price ˜ Rs 137

Therefore, the correct answer is Option 1: 137.