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.
Mr. Carr is not entirely correct. The USPS issued a global forever stamp that pays the first class postage for an ordinary letter weighing not more than one ounce to anywhere in the world. This stamp was introduced in 2013 and sold for $1.10, the rate current at that time. Now this stamp will cost you $1.15, but if you buy them now, when the rate increases, they will still be valid for the full postage rate at the time. Albert van Veen, Collector and history hobbyist for 50 years.