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.
USPS Truck [Photo by Justin Sullivan/Getty Images]The price of a stamp for a First Class Mail Letter (1 oz.) today is $0.49 which makes a book of 10 stamps cost $4.90, a book of 20 $9.80, and a coil of 100 $49.