a) b) d) The cost of first-class postage stamp was 3 in 1965 and 33 in 2010. This increase represents exponential growth. Write the function for the cost of a stamp tyears after 1965 (t = 0). What was the growth rate in the cost? Predict the cost of a first-class postage stamp in 2016, 2019, and 2022 The Forever Stamp is always valid as first-class postage on standard envelopes weighing 1 ounce or less, regardless of any subsequent increases in the first-class rate. An advertising firm spent 53300 on 10,000 first-class postage stamps in 2009. Knowing it will need 10,000 first-class stamps in each of the years 2010-2023, it decides at the beginning of 2010 to try to save money by spending $3300 on 10,000 Forever Stamps, but also buying enough of the stamps to cover the years 2011 through 2023. Assuming there is a postage increase in each of the years 2016, 2019, and 2022 to the cost predicted in part (c) how much money will the firm save by buying the stamps? a) Choose the correct answer below. O A. S(t) = 3 ekt OB. S(t)= 0.05 e34 OC. s(t)=0.05 e 331 OD. S(t)=3 0.05 b) The growth rate is approximately [%. (Round to the nearest integer as needed.) c) The cost of a first-class postage stamp in 2015 is . (Use the answer from part (a) to find this answer. Round to the nearest integer as needed.) The cost of a first-class postage stamp in 2018 is (Use the answer from part (a) to find this answer. Round to the nearest integer as needed.) The cost of a first-class postage stamp in 2021 is . (Use the answer from part (a) to find this answer. Round to the nearest integer as needed.) d) The firm will save $by buying the stamps at the beginning of 2010. (Use the answers from part (C) to find this answer.)