9. The military district canteen needs 1000 pounds of rice and 200 pounds of millet for dinner. The quartermaster goes to the rice store and finds that the store is having a promotion. “Rice is 1 yuan per pound, and for every 10 pounds purchased, 1 pound of millet is given as a gift (no gift for less than 10 pounds); millet is 2 yuan per pound, and for every 5 pounds purchased, 2 pounds of rice are given as a gift (no gift for less than 5 pounds).” What is the minimum amount of money the quartermaster needs to pay to buy enough rice and millet for dinner?
【Analysis】Whether it is buying rice and getting millet for free, or buying millet and getting rice for free, it means that for every 10 yuan spent, you get 12 yuan worth of grains. If the total value of the grains to be bought is 1400 yuan, $1400 \div 12=116 \cdots 8$,
therefore, at least $116 \times 10+8=1168$ yuan needs to be spent.