The application problem of mathematical inequality in the second grade of junior high school ~ ~ Find the solution ~ ~

Solution: (1)4.9-0.8=4. 1 yuan/liter, 1-0.8=0.2 yuan/liter.

A: Before the scheme adjustment, the gasoline price was 4. 1, and the fuel tax was 0.2 yuan/liter;

(2) It is more cost-effective to drive X kilometers per month than before the scheme adjustment.

∫ The fuel consumption per100km is10l.

∴ The fuel consumption is 0. 1 kilometer/liter.

According to the meaning of the question, it is 4.1x× 0.1+120 > 4.9 x× 0.1.

The solution is x <1500;

A: The monthly mileage of automobiles is within the range of 0 to 1500 km, which is more economical than before the scheme adjustment.