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.
Credit: Jerry Kobalenko All Canada Photos Getty Images. Each postage stamp is worth 49 cents as of 2014. Therefore, it takes three of them to cover the cost of $1.15. However, that is more postage than is needed to mail the letter, as the three stamps are equal to $1.47.