The investment in electricity and thermal energy in 1995 in these two districts formed what per cent of the total investment made in that year?

Total investment in year $$1995 = 7081.6 + 2923.1 = 10004.7$$
Total electricity and thermal invesment in year 1995 for both villages = $$815.2 + 632.4 + 2065.8 + 1232.7 = 4726.1$$
Percentage investment = $$\frac{4726.1}{10004.7} \times 100$$ 
Through approximation method, we can say that above value will be less than 50 and more than 47
Hence among all options, B will be most appropriate answer.