Explanation:

- Two types of pulses, X and Y, are mixed in the ratio of 7:20.

- The prices per kg are ?100 for X and ?150 for Y.

- To find the price of the mixture, calculate the weighted average of the prices based on the given ratio.

- The formula for the weighted average price is:

$$ \text{Weighted average} = \frac{(7 \times 100) + (20 \times 150)}{7 + 20} $$

- Simplify the formula:

$$ = \frac{700 + 3000}{27} $$

$$ = \frac{3700}{27} $$

$$ = 137.04 $$

- The nearest whole number for the price is ?137.

- Highlight: Option 1: 137