This equates to nearly 900 hours of instruction per year, which is similar to or less than many U.S. states, including Florida, New York, Texas, and Massachusetts. At the middle school level (grades 6-8), Chinese students attend just under 1,000 hours of school per year, a figure similar to that of most U.S. states.
1 Hiring a professional pressure-washer costs about $0.08-$0.35 per square foot (depending on local rates), but can go as high as $0.40-$0.80 a square foot depending on the amount and type of stains, dirt, mold or other problems. Buying a basic residential pressure washer with an electric motor starts around $70-$200, depending on size and capacity. 2  A gas-powered residential model usually has a higher pressure rating than an electric machine, and is about $300-$1,000.
How Much Does it Cost to Pressure Wash a Deck or Patio? Average estimates: $250 to $500. Pressure washing is a great practice to perform on your patio or deck during the spring to get rid of all those leaves and dirt buildup. It's a quick cleaning machine that saves on you having to get out the broom and spend hours outside.