Explanation:

- The price of sugar has increased by 22%.

- The person wants to limit the increase in expenditure to only 12%.

- To find out the percent decrease in consumption, we use the formula: $$\text{Required Decrease in Consumption}=\frac{\text{Increase in Price}-\text{Desired Increase in Expenditure}}{1+\text{Increase in Price}}$$

- Plugging in the numbers: $$\text{Percent Decrease}=\frac{0.22-0.12}{1.22}$$

- Simplifying: $$\text{Percent Decrease}=\frac{0.10}{1.22}\approx 0.081967$$

- Converting this into a percentage: $$\approx 8.2\mathrm{\%}$$

- ?? Correct option: 2, 8.2%