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.
Find out how much your project will cost. Provide a few details about your project and receive competitive quotes from local pros. The average national cost of power or pressure washing an exterior surface is $284, with most homeowners spending between $185 and $383.This data is based on actual project costs as reported by HomeAdvisor members.rovide a few details about your project and receive competitive quotes from local pros. The average national cost of power or pressure washing an exterior surface is $284, with most homeowners spending between $185 and $383. This data is based on actual project costs as reported by HomeAdvisor members.