mework: Section 4.5 K Part 2 of 2 In 2 Use the formula t that gives the time for a population, with a growth rate k, to double, to answer the following questions. The growth model A=70.005t describes the population, A, of a country in millions, t years after 2003. a. What is the country's growth rate? 0.5% b. How long will it take the country to double its population? years (Round to the nearest whole number.)