The price of a dishwasher was reduced from $400 to $200 because it was on clearance. By what is the percent decrease in price of the dishwasher?

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.