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.
Standard mail, such as first-class letters and postcards, make up 76% of the Postal Service's sales -- all of which have prices capped by Congress. Postcard stamp prices will drop by a penny to 34 cents, and international stamps will cost $1.15, down from $1.20. There's hardly anyone alive who remembers the last time the price of a stamp fell. That was in July 1919, when first-class stamp prices dropped from 3 cents to 2 cents.