The higher the solar fraction, the greater the solar contribution to water heating, which reduces the energy required by the backup water heater. The solar fraction varies from 0 to 1.0. Typical solar factors are 0.5â0.75. Don't choose a solar water heating system based solely on its energy efficiency.
Price of a Stamp. The current price of a first class stamp is 49 cents. A domestic first class letter (1 oz.) is 49 cents. The price of each additional ounce is 21 cents. It will cost you 34 cents to send a domestic postcard.
A: According to the U.S. Postal Service, the price of a first-class postage stamp in the United States is 49 cents as of June 2014. This rate applies to standard-sized mail weighing 1 ounce or less. Letters weighing more than 1 ounce cost an additional 21 cents to mail.