The table below shows the cost C, in cents, of a domestic first-class postage stamp in the United States, t years after 1900. (a) Find the exponential model (a.k.a., function) which best fits the above data and which gives the cost, C, in cents, of a stamp as a of the numbers of years, t, since 1900. Round the numbers in your model to three decimal places. (b) According to your model, by what percentage does the price of a stamp go up each year? Round your answer to one decimal place. (c) According to your model, how long (in years) does it take for the cost of a domestic first-class stamp in the U.S. to double? Round your answer to one decimal place