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.
Related Coverage. (WKRG) â Beginning Sunday, Jan. 22, the price of forever stamps will go up to 49-cents which is an increase from the current price of 47-cents. This is the first time since 2015 that the U.S. Postal Service has raised the price of stamps. However, stamps only cost 47-cents for less than a year after a price drop in April 2016.