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According to the title, the annual national debt investment is 1 100 million yuan, and the scope of total investment can be calculated according to "the total investment driven by national debt investment per yuan can reach yuan to yuan". .

Then, according to "the total investment driven by national debt investment will be converted into labor wages and become the income of urban and rural residents", the income of urban and rural residents brought by national debt investment will be calculated.

According to "the sum of the percentage points of national debt investment-driven growth in and is more than twice that of national debt investment-driven growth in, if the percentage point of national debt investment-driven new growth in the whole year is 0, it can be expressed as a functional relationship with.

According to the employment units created in the sum, we can express the role of investment in the employment units created in the sum respectively according to the investment situation in the sum.

Then, according to these three equations, the value of the independent variable is obtained.