A factory's profit (total output value total expenditure) last year was 2 million yuan. This year's total output value increased by 0.2, total expenditure decreased by 0.1, and this year's profit is 7.8 million yuan. Last year's total output value, total expenditure is how many million yuan? Use one yuan equation!

A factory's profit (total output value total expenditure) last year was 2 million yuan. This year's total output value increased by 0.2, total expenditure decreased by 0.1, and this year's profit is 7.8 million yuan. Last year's total output value, total expenditure is how many million yuan? Use one yuan equation!

Suppose that the total output value of last year x, total expenditure X-200, the equation
X * (1 + 20%) - (X-200) * (1-10%) = 7.8 million
Solve the equation and get the result
X = 20 million yuan
Total expenditure = 20-200 = 18 million yuan
Last year's total output value was 20 million yuan and total expenditure was 18 million yuan

What is China's GNP and per capita GNP in 2013?
The figure released by the National Bureau of statistics is 56884.6 billion yuan, but the total GDP is 63 trillion yuan, which is equivalent to one more GDP of Guangdong Province. Why?

In 2013, China's GDP was 56884.5 billion yuan

At the end of 1990, a village had a total population of 1000 people, and the total industrial and agricultural output value of the whole year was 20 million yuan. Suppose that the total output value of the village increased by 500000 yuan every year in the 10 years since 1991, and the net population increased by K (where K is a positive integer constant). Suppose that the per capita output value of the village in the x year since 1991 (1991 is the first year) is y (10000 yuan)
(1) Try to write the functional relationship between Y and X;
(2) In order to make the per capita output value of the village increase year by year, how many people can the net increase of the annual population of the village not exceed?

（1）y=2000+50x/1000+kx
(2) In 2005, the per capita output value was 20000 yuan
By year x, the total output value will be 2000 + 50kx
The population is 1000 + KX
Then (2000 + 50x) / (1000 + KX) > 2
That is 2000 + 50x > 2000 + 2kx
k

At the end of 2003, there were 1500 people in a rural area, and the annual industrial and agricultural production value was 30 million yuan
At the end of 2003, there were 1500 people in a rural area, and the annual gross industrial and agricultural production value was 30 million yuan. From 2004, it is planned that the total output value of the village will increase by 500000 yuan every year, and the population will increase by a person every year, (1) write the functional relationship between X and Y; (2) in order to make the per capita output value of the village increase year by year, how many people can the net increase of the village's annual population not exceed?

(1) Y = (3000 + 50x) / (1500 + ax) (2), y '= [50 (1500 + ax) - (3000 + 50x) a] / (1500 + ax) ^ 2 = [75000-3000a) + 50ax-50ax] / (1500 + ax) ^ 2 = (75000-3000a) / (1500 + ax) ^ 2 as long as y' is greater than 0, the per capita output value increases year by year