Chapter 2, Verses 13 and 14 - Sun Tzu

With this loss of substance and exhaustion of strength, the homes of the people will be stripped bare, and three-tenths of their income will be dissipated; while government expenses for broken chariots, worn-out horses, breast-plates and helmets, bows and arrows, spears and shields, protective mantles, draught-oxen and heavy wagons, will amount to four-tenths of its total revenue.
~ from The Art of War, Giles translation ~

Go here to read the introductory post to the verses of The Art of War.