Take logarithm base d {\displaystyle d} of both sides: log d â¡ b c = log d â¡ a {\displaystyle \log _{d}b^{c}=\log _{d}a}. Simplify and solve for c {\displaystyle c} : c log d â¡ b = log d â¡ a {\displaystyle c\log _{d}b=\log _{d}a}. c = log d â¡ a log d â¡ b {\displaystyle c={\frac {\log _{d}a}{\log _{d}b}}}.
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. Postage Rate Timeline.
Stamp prices going up Sunday. These forever stamps honoring President John F. Kennedy will be dedicated on Presidents Day. The price of a forever stamp will rise Jan. 22, 2017. SPRINGFIELD -- The Postal Service will raise the price of its first-class forever postage stamps by 2 cents on Sunday, Jan. 22. The price of a stamp will go from 47 cents to 49 cents. The hike was approved by the Postal Regulatory Commission last year.