By the early 1990s, Rwanda, a small country with an overwhelmingly agricultural economy, had one of the highest population densities in Africa. About 85 percent of its population is Hutu; the rest is Tutsi, along with a small number of Twa, a Pygmy group who were the original inhabitants of Rwanda.
1 Power sanding, stain and seal â This is a very aggressive procedure normally used on decks that have not been well kept or are changing color. The average cost is $2 to $4 per square foot.  Light sanding, stain and seal â This is a general annual treatment for a deck.
How to Stain a Concrete Walkway. Staining a concrete walkway is a low cost option for adding significant curb appeal. With a few simple tools, you can stain your walkway for as little as 50 cents per square foot. The most important thing to remember is, once the process has begun you cannot stop.